Adapt tests to work with open62541 v1.4.7 and adapt login tutorial

[thomvet]

open62541 pushed a new release recently (1.4.7) with the following release notes: https://github.com/open62541/open62541/releases

server: Consider allowNonePolicyPassword in GetEndpoints

Means that the server now actually checks the value of this configuration option. The net result is that one either:

• puts the above value to true, i.e., allowing to send passwords&usernames unencrypted over the network or
• keep the above value on false (the default) and one has to have an encryption policy specified.

Obviously, the second option is the safer one. I'll make an appropriate tutorial regarding using encryption soon (and include appropriate tests), but for now it would be great to have the tests pass again as a "quick fix"

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.28%. Comparing base (4861778) to head (08701b6).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #33      +/-   ##
==========================================
+ Coverage   40.89%   42.28%   +1.39%     
==========================================
  Files          13       13              
  Lines        4377     4377              
==========================================
+ Hits         1790     1851      +61     
+ Misses       2587     2526      -61     

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[thomvet]

Added a testset where a server and client are configured with encryption. It is then tested that a user using encryption is allowed to connect, while a user trying to connect without encryption is rejected by the server.

Now I only have to add a tutorial where this is put together with the username/password login case that is already there. (hopefully will get to it tonight).

[thomvet]

Tutorial added; this is ready for review!

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