CA-111310:  Call VDI.copy asynchronously to avoid timeout [SCTX-1366]

- Changed the synchronous call to VDI.copy to an async one in VMMoveAction and MoveVirtualAction;
- Corrected the calculation of action step in VMMoveAction.

Signed-off-by: Mihaela Stoica <mihaela.stoica@citrix.com>
CA-110610:  It should be possible to apply a free license to a 6.1 or earlier pool if the pool has two or more servers in it.

- split the pool members out when they're free, as the activation keys can only be applied to one XenServer host at a time

Signed-off-by: Mihaela Stoica <mihaela.stoica@citrix.com>
Merge branch 'master' of git://hg.uk.xensource.com/carbon/trunk/xenadmin