JBDS-2515 - Scan ~/jboss-runtimes automatically

https://issues.jboss.org/browse/JBDS-2515
JBDS70_0011: [Commit] (Dev) (P3) Scan ~/jboss-runtimes automatically
directory is never null here. The rest of code looks OK for me.
Any objections to merging this PR?
Fred, Rob?