Tools for monitoring message bus

*FOR REVIEW ONLY*. Please do not commit. It's incomplete.
I haven't completed the specfile changes, nor touched
the Makefiles.

Status as of 2014-09-30T14:30 EDT: build-monitor is running
under systemd on test host. So is the kinit refresher, on
a 2-hour systemd timer.

WORK REMAINING:
  * Deciding on a username/groupname for unprivileged running
  * Few hours of packaging work (less if done by someone
    familiar with the existing specfile & autoconf).
  * Review
  * Coordination between monitor & treecompose scripts (socket)