Update stats tools for the new homestead stats
Move homestead-prov stats to port 6667
Revert bad change to the C-version of the stats tool
Move homer/homestead-prov stats to port 6667, and render the homestead-prov stats as the right type
Rework ruby stats collector to allow subscriptions
Add the ability to specify what ports to pull stats from
Merge pull request #372 from Metaswitch/new_homestead_stats

[Reviewer: Matt][From: Alex] Update stats tools to cope with homestead stats.