Corrected AZ FilterAction and table filter

The Availability Zone table was using the Host Aggregates filter action
so that has been changed to use the correct filter action, and fixed
Availability Zone filter action accessing an attribute that did not exist.

Change-Id: Ib9daaaeffade0ee30115f47f065f9f86ec6eb70c
Closes-Bug: 1362850
Avoid string concatenation in Volume Type Extra Spec Edit

We should avoid using string concatenation so that translators
can control the word order in their translations.

Change-Id: I7a717b15fc978eec4448caf0962e2ffacfaf7645
Closes-Bug: #1366481
Merge "Corrected AZ FilterAction and table filter"
Merge "Avoid string concatenation in Volume Type Extra Spec Edit"