1) add forgotten initialize.gsh file
2) fix Dockerfile FROM dependency

This is basically a clone of demo/complex2s from the laboratory branch.

Main differences:

1. Fixed "unknown host directory" error message when building
grouper_data container. The initialization script is no longer run
at build time in grouper_data. It is instead run at first start of
grouper_daemon container, when LDAP server is already up.

2. banderson and sysadmingroup is now created when building LDAP container.
So the Grouper resource test action can be executed directly, without
the need to prepare midPoint objects for banderson & sysadmingroup first.

Note that tests were not updated yet.

- Updated master branch with changes from the laboratory
- Temporarily removed obsolete demo/complex
- Fixed download script to reflect new URL of midPoint distribution server
- Upgraded midPoint to 4.0.1

This is only until update to Shibboleth 3 is done.

Host names containing underscore (e.g. grouper_ws) are not valid
according to RFC1123; and this is endorsed by Apache httpd. So, for
demo/complex we provide correct aliases e.g. grouper-ws. We should
perhaps do the same also for the other scenarios.

From 1000 to 100 users, to speed up initial setup.

…int_container into stem-less

DB upgrade test (360 in demo/simple) is not relevant for 4.0-SNAPSHOT.
It should be re-enabled after DB schema for 4.0 is stable.

These are to be linked only if they exists.

Sometimes we are trying to pull an image that is not pushed yet.