webadmin,userportal: clone VM

Implementation of the clone VM feature.
- Adds a new button to the UP/WA Vm lists
- Adds a new dialog which contains:
  - clone name
- calls the CloneVmCommand

Change-Id: I6ae2bca7ce33412da3881ccadc9bb1543e32ace2
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1058832
Signed-off-by: Tomas Jelinek <tjelinek@redhat.com>