Updates available resources after live migration

A new VM can't be deployed using resources of the VM that has been migrated
to a new host before the periodic task is called after a live migration.

This change calls update_available_resource() after live
migration is completed even before the next periodic task takes place.

Change-Id: I4c879dcfb1e76cfdc95612b6d8010c1081ac45b9
Closes-Bug: #1267862
Merge "Updates available resources after live migration"