engine:Trusted Compute Pools - Open Attestation integration with oVirt engine

Detailed description: http://wiki.ovirt.org/Trusted_compute_pools

Add Audit log message when importing a vm that was created in a trusted cluster into a non-trusted cluster and vice-versa.

Change-Id: Ib934302c603c8646f750bafbf343e4481b4d36b7
Signed-off-by: Jimmy <gang.wei@intel.com>
Signed-off-by: Emily <lijuan.zhang@intel.com>