midPoint might take longer to start in some environments

Max connections fix for midpoint training

The image was renamed in 56c76a5 but in
order to work, it has to be changed in additional files.

Images are tagged using midPoint version insted of using always tag latest

Add midpoint_home/lib to start string

Per the 4.2.x release instructions need several items added to start string if using custom startup scripts. https://docs.evolveum.com/midpoint/release/4.2/

This resolves issues with deleted groups (MID-6756, MID-6900).

Those test works locally but sometimes they are failing in I2 build
system. Therefore they are temporary disabled now, until we will find a
solution for it.

Test were failing because MID-6721 bug. Workaround applied.

Remove SOAP interface tests because SOAP is no longer supported in
midpoint 4.2.

Fix typo in curl --silent option.

Update docker-compose-tests.yml with recent changes from
docker-compose.yml file. docker-compose-tests.yml should contain the
same configuration as docker-compose.yml, only it minimizes the ports
exported to localhost, because it's not necessary for tests.

Fix tests for internal SAML.
Add tests for Shibboleth integration.

SAML2 authentication is now using Shibboleth SP by default. SP embeded
in midPoint si also available on a different URL.