Archetype fully working and self-tested

CONTROLLER-1799 will fix the Archetype to finally be "self tested" again. That takes care of the 1st "possible future TBDs" of https://git.opendaylight.org/gerrit/#/c/62978/.  Others were:

• re-activate commented out IT which breaks during build self test
• odl-X* feature directory names with ${artifactId} instead of X (dunno how to get archetype to create folders named by variables)
• karaf.localFeature which breaks during build self test
• some clean-up e.g. remove useless site generation?
• real test of the produced Karaf distro? Using Pax Exam, but not *IT.

I meanwhile have itestutils in infrautils which should be used for the Archetype IT, instead of controller:mdsal-it-parent.

While we're at this (or perhaps more importantly?) we should add an example of a Guice based Component Test to the Archetype as well.