Server side encryption tests should be optional

[rluetzner]

Is your feature request related to a problem? Please describe.
Mint expects a certain error message if SSE is not configured for the underlying MinIO instance. By using a reverse proxy in front of MinIO as a TLS sink, MinIO detects the incoming requests as unencrypted and blocks any incoming SSE requests.

When using a reverse proxy this is expected behavior.

Describe the solution you'd like
SSE tests should be skipable by setting an environment variable when executing the test suite.

Describe alternatives you've considered

1. Encrypt traffic between the reverse proxy and MinIO. Even without considering the possible performance loss, this would also require us to deploy and maintain multiple additional TLS certificates. This seems unnecessary.
2. If Execute all tests even if some of them fail #4 is fixed this has a rather low priority as test results are easier to compare when tested against MinIO or any other S3 target.

Additional context
None.

[iternity-dotcom]

@rluetzner Can we close this?

[rluetzner]

Yes.