[Reviewer: Matt] Homestead as HSS development

Fixes issues: metaswitch/crest#164, metaswitch/crest#162, metaswitch/crest#47. In conjunction with Phil's change of moving monit to upstart metaswitch/crest#148 should also be fixed. Also, included are ENTs for improved craft/syslog logs. Plus, command line tools for provisioning subscribers in the absence of Ellis.
Without the existence check, if you do a back up before ever provisioning anything, you end up with errors (cp: cannot stat `/var/lib/cassandra/data/homestead_provisioning/private/snapshots/*/*': No such file or directory) at the 'cp -al...' line.