Non existant repositories (WicketStuff and JBoss) in sitestats cause build problems

Appeared to be causing this build error, these repositories don't exist anymore anyway so should just be removed.

[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Unable to read local copy of metadata: Cannot read metadata from '/var/lib/jenkins/.m2/repository/org/sakaiproject/master/maven-metadata-org.wicketstuff.xml': end tag name </HEAD> must be the same as start tag <META> from line 8 (position: TEXT seen ...<TITLE></TITLE>\r\n</HEAD>... @10:8)