Removes os-personalities extension from the V3 API

As per the discussion on the mailing list here:

http://lists.openstack.org/pipermail/openstack-dev/2013-September/015490.html

and discussions at summit, this patch removes the os-personalities
from the V3 API.

DocImpact

Part of blueprint v3-api-remove-extensions

Change-Id: I1a57ca812a9d71c0b1bab5d16ffad8eb82cba539
Merge "Removes os-personalities extension from the V3 API"