MODCLUSTER-367 Add missing commits to master

https://issues.jboss.org/browse/MODCLUSTER-367

There are 40 commits missing. Rebased. Please test and merge. With this backport, the master branch changes compared to 1.2.x are:

* connector metric change for WF8
* advertism mechanism check
* load demo fixes
* debug analyze BZ #906012
* minor documentation fixes
* minor .gitignore change
* pom versions of course

(related etherpad http://pad.engineering.redhat.com/SYNyK3CK4G )