Add support for snapshot quotas.

Now we have [volumes, gigabyes, snapshots] as valid
tenant quotas.

Change-Id: Iae8a86b31e63b9e56d6ef0bee7e03f4089aa8138
Remove unused tools/rfc.sh

This has been deprecated in favour of git-review for quite a while now
and was removed from Nova 10 months ago.

Change-Id: Ic4bfa1aee3a4b6a7588be3678ac033a1b13e2b18
Merge "Add support for snapshot quotas."