[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.
I'm kind of surprised we've written this all in bash.  Wouldn't it have been more maintainable to reuse the python code that already exists in ellis?

I haven't reviewed the rest of this code in a huge amount of detail - I think it's worth addressing the above first.