Enable inter-datacenter migration, providing support for multi-cloud simulations #361
Description
FEATURE
VM migration just works inside the same Datacenter. If that one doesn't have suitable Hosts for performing intra-datacenter migration, a different datacenter should be tried.
Detailed information about how the feature should work
If suitable Hosts cannot be found inside the Datacenter linked to a VmAllocationPolicyMigration instance,
the next datacenter from the CloudInformationService datacenter list must be tried.