docker / midPoint_container

Set worker threads for async update task
This is necessary for correct state reporting.

Add demo/grouper tests
Although the tests are quite advanced, they are not really complete yet.
Most notably, group membership update in LDAP is not checked now.
We should include running Trigger Scanner in these tests eventually.

Fix demo/complex tests
Sometimes we are trying to pull an image that is not pushed yet.

Modify image references to midpoint:3.9-SNAPSHOT-stable
(instead of midpoint:latest)

Merge branch 'master' into 3.9-SNAPSHOT-stable

Update README.md files

Fix tests numbering

Make download-midpoint point to 'stable' tgz

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

Remove port 80 from Grouper
This is to avoid Shibboleth problems when opening
http://localhost/grouper instead of https://localhost/grouper.