ethan / HR-midPoint-Grouper-Wordpress-Demo

Now all components are started within single docker-compose.yml file.

This is to avoid collisions with the more stable
build from the "bats" branch.

Environmental variables and container names are improved.
Only demo/simple is OK now; other ones are inconsistent now.

1. xpath -> xmllint
2. added some docker containers cleanup

...and added cleanup step as well

Might fail if xpath is not installed.

Also with other minor enhancements.

1. demo/plain -> demo/simple
2. updated README.MD

The container is now built directly from the root directory.
Even the simplest composition was moved to demo/plain.

(only a dummy test for now)

1) There's now a cleanup step before and after running the tests
2) Tests check their results more thoroughly
3) Until MariaDB is changed, a temporary solution for down-up issue is present

Added
 - 110: get administrator
 - 120: add+get user
 - 200: stop+start containers (failing, but ignoring that)
 - 300: repository preservation (disabled)

It was not easy to build two Docker images in TIER Jenkinsfile
(using docker/util). It seems that tier/mariadb:mariadb10 is OK to be
used with midPoint without any customizations, so we use it.

...and added slack notifications as well.