Do not show quota of removed volume types in Default Quotas panel

Fixes the issue where quota for removed volume types still show up
in Admin -> Defaults -> Default Quotas view.

Change-Id: I2a822ac08b8347a8d76e8de70deca0e34fafe6e3
Closes-Bug: #1266906
Merge "Do not show quota of removed volume types in Default Quotas panel"