Aligned with vanilla midPoint container. Upgrade to midPoint version
4.8.3. Most of the configuration is dynamic, limiting the need of
building custom containers.

There is a problem with Grouper inicialization, that needs fixing.
Shibboleth and simple demo works well.

Metadata were changed with the replacement of shib-SP container
introduced in commit db1f10d

Includes fixes of shibboleth SP upgrade done in previous commits.
Includes fix of error message parsing in tests.

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

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.

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.