Stubout cinder.tenant_absolute_limits in cinder test

To render dropdown actions to detail page, allowed() method
in the volume table is called, so a method called in allowed()
needs to be stubout.

Change-Id: Ib65eee0fa2c8b6535e1e391579fcd1bdb0f83bc1
Closes-Bug: #1378907
Make labels in Network Topology translatable

Fix the button and object labels in the network topology pop ups to be
translatable and concatenation-free.  Use "None" as the not found value to be
consistent with the network ports detail screen.  This patch excludes
fixing the status values.

Partial-Bug: #1323599
Change-Id: Ia0c92842703109401d758d5ac3ccefab9ccf6971
Merge "Stubout cinder.tenant_absolute_limits in cinder test"
Merge "Make labels in Network Topology translatable"