Update JBoss cart specs for new metrics location

Add dependency on jboss-openshift-metrics-module to the jbossas and
jbosseap cartridges.

Create symlinks in /etc/alternatives/{jbossas-7,jbosseap-6} that point
to the shared JBoss metrics module location.
Merge pull request #5372 from ncdc/jboss-metrics-deps

Merged by openshift-bot