webadmin: free space indication for storage domains

Added free space indication in storage domains in select-boxes.
Affected dialogs:
* New disk
* Copy/Move Disk
* New VM -> Resource Allocation tab
* Make template
* Import VM

Change-Id: I64cf597289534bb12019b09d1d84ad9e64f5b34e
Bug-Url: https://bugzilla.redhat.com/760666
Signed-off-by: Daniel Erez <derez@redhat.com>
webadmin: VMs main-tab - create snapshot action

Adding 'Create Snapshot' action on VMs main-tab
(into action-panel and as a context-menu button).

Change-Id: I555695fd0239d966268bc245bd7e7574d6a34f30
Bug-Url: https://bugzilla.redhat.com/909930
Signed-off-by: Daniel Erez <derez@redhat.com>