engine: Throw canDo on addVmCommand if template is not in cluster

added a canDo-
'VdcBllMessages.ACTION_TYPE_FAILED_TEMPLATE_NOT_EXISTS_IN_CURRENT_DC'
to-
AddVmCommand- if the templates is not in the vm's dc.
AddVmFromScratchCommand- if the templates is not in the vm's dc
                         and not 'Blank'.

Change-Id: I2566b18049bf7603700572dc5d419a640f294ada
Bug-Url: https://bugzilla.redhat.com/1103058
Signed-off-by: Alona Kaplan <alkaplan@redhat.com>