Updated openstack/openstack
Project: openstack/nova  46c931f7dac6d983a738aae10bc670311a93af42
null
Change RPC post_live_migration_at_destination from call to cast

We don't expect post_live_migration_at_destination to return anything,
so change call to cast.

Change-Id: Iccdb6e195d1d5d9b96e1372206823d414caae872