wip: cleanup(userspace/libsinsp,test,build): drop container manager

[FedeDP]

What type of PR is this?

/kind cleanup

Any specific area of the project related to this PR?

/area build
/area CI
/area libsinsp
/area tests

What this PR does / why we need it:

Following falcosecurity/falco#3403, this PR does multiple things:

• drops all container related code
• drops all container related tests
• drops grpc,curl,openssl and cares deps that are not needed anymore
• drops MINIMAL_BUILD whose only purpose was to disable gvisor; we already have a flag for that: BUILD_LIBSCAP_GVISOR
• Allows e2e tests (not libsinsp_e2e ones) to run by downloading the plugin, since they test spawning containers

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Opening this just to let other people know about the cleanup; also, this will be wip until all TODOs below are done.

TODO:

• reimplement ifinfo.cpp sinsp_network_interfaces::is_ipv4addr_in_local_machine(): https://github.com/falcosecurity/libs/blob/master/userspace/libsinsp/ifinfo.cpp#L326
• reimplement sinsp_filtercheck_user.cpp sinsp_filter_check_user::extract_single : https://github.com/falcosecurity/libs/blob/master/userspace/libsinsp/sinsp_filtercheck_user.cpp#L93
• move m_program_hash and m_program_hash_scripts as foreign key filled in by the container plugin and drop compute_program_hash. OR, use a RAII object just like we did for users/groups (chore(userspace/libsinsp): move user group manager on container_id changed refresh to a RAII object #2194) -> after a discussion with @jasondellaluce we decided to go the cleanup(userspace/libsinsp): call sinsp_observer methods after an event has been processed by all parsers #2222 route: since sinsp (and Falco) are not using those fields, we offload their implementation to the libs consumers, if needed.

Less important:

• you'll note that the plugin is being downloaded by upstream releases that are only available for x86_64: https://github.com/FedeDP/container_plugin/releases. Instead, we will download latest artifacts once we have a proper CI on top of it (ie: once the plugin is donated to the https://github.com/falcosecurity/plugins repo) for both architecture. Note arm64 is not used actually because we only run e2e tests on x86_64 for now.

Does this PR introduce a user-facing change?:

cleanup(userspace/libsinsp,test,build): drop container manager
cleanup(build): drop MINIMAL_BUILD

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: FedeDP

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[FedeDP]

cc @falcosecurity/libs-maintainers

[github-actions]

Perf diff from master - unit tests

   100.00%    -99.54%  [.] 0x00000000000ed560

Heap diff from master - unit tests

peak heap memory consumption: 717.37K
peak RSS (including heaptrack overhead): 0B
total memory leaked: 139.92K

Heap diff from master - scap file

peak heap memory consumption: 272.98K
peak RSS (including heaptrack overhead): 0B
total memory leaked: 141.11K

Benchmarks diff from master

Comparing gbench_data.json to /root/actions-runner/_work/libs/libs/build/gbench_data.json
Benchmark                                                         Time             CPU      Time Old      Time New       CPU Old       CPU New
----------------------------------------------------------------------------------------------------------------------------------------------
BM_sinsp_split_mean                                            +0.0107         +0.0108           146           148           146           148
BM_sinsp_split_median                                          +0.0143         +0.0144           146           148           146           148
BM_sinsp_split_stddev                                          +0.0305         +0.0307             1             1             1             1
BM_sinsp_split_cv                                              +0.0196         +0.0197             0             0             0             0
BM_sinsp_concatenate_paths_relative_path_mean                  +0.0157         +0.0158            56            56            56            56
BM_sinsp_concatenate_paths_relative_path_median                +0.0175         +0.0176            56            56            56            56
BM_sinsp_concatenate_paths_relative_path_stddev                +0.5840         +0.5822             0             0             0             0
BM_sinsp_concatenate_paths_relative_path_cv                    +0.5595         +0.5576             0             0             0             0
BM_sinsp_concatenate_paths_empty_path_mean                     +0.0107         +0.0108            25            25            25            25
BM_sinsp_concatenate_paths_empty_path_median                   +0.0092         +0.0094            25            25            25            25
BM_sinsp_concatenate_paths_empty_path_stddev                   +0.2310         +0.2298             0             0             0             0
BM_sinsp_concatenate_paths_empty_path_cv                       +0.2180         +0.2167             0             0             0             0
BM_sinsp_concatenate_paths_absolute_path_mean                  +0.0625         +0.0626            55            58            55            58
BM_sinsp_concatenate_paths_absolute_path_median                +0.0719         +0.0720            55            59            55            59
BM_sinsp_concatenate_paths_absolute_path_stddev                +4.4822         +4.4900             0             1             0             1
BM_sinsp_concatenate_paths_absolute_path_cv                    +4.1597         +4.1666             0             0             0             0
BM_sinsp_split_container_image_mean                            +0.0010         +0.0011           385           385           385           385
BM_sinsp_split_container_image_median                          +0.0023         +0.0024           386           387           386           387
BM_sinsp_split_container_image_stddev                          +0.4272         +0.4284             2             3             2             3
BM_sinsp_split_container_image_cv                              +0.4258         +0.4268             0             0             0             0

[FedeDP]

/milestone 0.21.0

[codecov]

Codecov Report

Attention: Patch coverage is 30.00000% with 21 lines in your changes missing coverage. Please review.

Project coverage is 76.85%. Comparing base (69cfe47) to head (079cef8).
Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
userspace/libsinsp/examples/test.cpp	0.00%	17 Missing ⚠️
userspace/libsinsp/sinsp_filtercheck_fd.cpp	57.14%	3 Missing ⚠️
userspace/libsinsp/event.cpp	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2207      +/-   ##
==========================================
+ Coverage   75.42%   76.85%   +1.42%     
==========================================
  Files         265      208      -57     
  Lines       34048    29980    -4068     
  Branches     5803     4653    -1150     
==========================================
- Hits        25681    23041    -2640     
+ Misses       8367     6939    -1428     

Flag	Coverage Δ
libsinsp	76.85% <30.00%> (+1.42%)	⬆️

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[FedeDP]

Will rebase on master once #2195 is merged too.