Implement Quota Support

Intented to be a quick implementation until OpenStack gains a centralised
quota service.

Change-Id: Ie8cc0e391e621905583e6fd76aad401df6d705a3
Ensure our quotas/limits are consistent with other OpenStack projects

Change-Id: Ib09a4339109765a7703020ebceed6acad60dc095
Ensure create domain/record records call the correct count_* methods

Change-Id: I31ac63d0f76f9e569868581d51aff54eef450475
The utils module in oslo is no more.

The utils module in oslo has been removed (with most of its
functionality moving across to strutils). Luckily it was imported
in heat but never actually used, so removing it is relatively easy.

Change-Id: Ic3cb8bb9bbae282f5a753c6abe58b1d47ad640db
Helper utilities

Change-Id: Ia689302fc1bcc3b11dceb51f131cdd4ac1ad30ba