Catch InvalidAggregateAction when deleting an aggregate

When an aggregate with 'host' attribute not empty is deleted,
InvalidAggregateAction exception will be raised, but this exception
is not handled.

Closes-Bug: #1303591
Change-Id: I4ef0c4a6008acea7e9769e93de79451cfbc0a0fa
Merge "Catch InvalidAggregateAction when deleting an aggregate"