Add create volume from volume

Cinder has the ability to create volumes as copy of a volume,
we should offer that as option via horizon, too.

This change also fixes bug 1272169

Change-Id: Idbded6ecd49ff097c063873352405ae2bd91715e
Implements: blueprint create-volume-from-volume
Closes-bug: #1272169
Move Network topology init call to template

This will prevent Network topology init function from being called on every page

Change-Id: Ia1005e592b82c7a1641ba8b45362084829fc62da
Closes-Bug: #1195471
Merge "Add create volume from volume"
Merge "Move Network topology init call to template"