In Drydock, yield for reclaiming resources in the "released" state
Summary: Ref T13677. This was an accidental change in D21807: when reclaiming a resource, wait for it to be completely destroyed before allowing a lease to reclaim another resource.
Test Plan: Reverts accidental behavior change in D21807.
Maniphest Tasks: T13677
Differential Revision: https://secure.phabricator.com/D21809