IdStory Identity Manager

I created new two tests for two filter builder. (Filter UsernameIdentityFilter has priority 10, this filter doesn't override filter from core, so I only check if override is correct).

commit: https://github.com/bcvsolutions/CzechIdMng/commit/3873f2a36bc4fdebdd0366d92dfef09c6d570d89 (branch: develop)
documentation:
https://wiki.czechidm.com/tutorial/dev/override_filter
https://wiki.czechidm.com/devel/documentation/architecture/dev/filters

Please Radek could you made a review?

Refactor tests the same way as here:
https://github.com/bcvsolutions/CzechIdMng/blob/develop/Realization/backend/core/core-impl/src/test/java/eu/bcvsolutions/idm/core/model/repository/filter/UsernameIdentityFilterBuilderIntegrationTest.java

Filter builder only can be tested.

Thanks for hint with test only one filter. I little bit refactored tests:

commit: https://github.com/bcvsolutions/CzechIdMng/commit/5d451481b47237f3a1d52ac82017039bf4655112 (branch develop)

updated documentation:
https://wiki.czechidm.com/tutorial/dev/override_filter#create_test_for_filter
https://wiki.czechidm.com/devel/documentation/architecture/dev/filters#example_filter_test

Please Radek could you continue with feedback? Thank you.

Thx, it's awesome :)

Note: I removed unnecessary login / out methods.