[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.
Commenting.  I really think we should a class comment to explain what this class is for.  I'd strongly recommend removing comments like `# Inherit from logging.Handler` - comment why the code does what it does, rather than transcribing Python into English.