Fixes to get builds and tests running on RHEL:

Fixing activemq installation for RHEL6
  broker.pp installs scl-ruby193 rpms for required gems instead of pulling from rubygems
  Install gems required by rhc within SCL container as well so that rhc tools can run under ruby 1.9
  Switch paths for rm, chown etc based on locations in F18 vs RHEL
  Fix yum repo paths to switch based on F18 vs RHEL
  Update mcollective to run in SCL environment in RHEL
  Update default origin rpm repo to point at nightly builds