Name already in use

On this branch we will download the latest stable TIER-capable
version of midPoint.

This is to avoid Shibboleth problems when opening
http://localhost/grouper instead of https://localhost/grouper.

Building is now more straightforward and better documented.
To quickly see timezone problems we have set Central timezone
for various containers.

It is superseded by "demo/complex" scenario, basically
having the same content.

This is a rework/update of the original "Grouper-midPoint" demo.
It is a work in progress. Do not use yet.

Changes in the midPoint Docker container:
1. Logging is improved: now we provide TIER-style logging for
   both midpoint.log content and plain console output. (Note that
   not all entry timestamps are in UTC yet.)
2. Reverted some of TIER beacon changes to make it more compliant
   with TIER standards: shell file names, opt-out environment variable,
   collector server name+port.

These changes are: Zulu JVM, logging fixes, TIER Beacon.
The crond is now running in foreground to avoid "can't lock
/var/run/crond.pid" messages.

...and added slack notifications as well.

...and added missing LOGOUT_URL one.

…/TIER/midPoint_container into shibboleth-integration

Now the default port is derived from the database type.
Also, PostgreSQL demo was cleaned up.

…ving mistakes in cron configuration

…ion' into shibboleth-integration

…/TIER/midPoint_container into shibboleth-integration

…ion' into shibboleth-integration

…/TIER/midPoint_container into shibboleth-integration

These containers are used to demonstrate Shibboleth-based SSO
capabilities of TIER midPoint Docker container. They are NOT to
be used in "midPoint-Grouper" demo.

Also fix treatment of environment variables.