Rollback quota when confirm resize concurrently completed

quota is reserved when confirm_resize is executed, if a concurrent
operation updated the status of migration, currently compute layer
will directly return back without rollback the quota and it can
lead to quota inconsistent issue layer.

Change-Id: I2217e9a4523d2783eccd8ef31c1fd65a604e2cc3
Closes-Bug: #1301690
Merge "Rollback quota when confirm resize concurrently completed"