core: wrong name is shown in event log when cloning a VM

The problem was that the VM name in CloneVmCommand was set to the source VM
while it was supposed to be set to the VM beeing created.

Change-Id: Ic1e09991269b3efc9b2f8f3befa95eb00efe19c7
Bug-Url: https://bugzilla.redhat.com/1128239
Signed-off-by: Tomas Jelinek <tjelinek@redhat.com>