JBIDE-18848 setup ide-config.properties test (experiment)

This code final resting place is probably *not* inside tests module, but I put it there to just get easily started
and be able to show the code running easily.

This additional test simply iterates all properties in ide-config.properties to do some basic validation.
Can you change those to devstudio.redhat.com? And what about testing /8.0/ and /7.0-development/, both with and without the /integration-stack/ path segment?