Description of problem: filestore-to-bluestore migration playbook exited successfully despite nt being able to create bluestore OSDs after purging filestore OSDs. Version-Release number of selected component (if applicable): ceph-ansible-4.0.10-1.el7cp.noarch How reproducible: Always (4/4) Steps to Reproduce: 1. Configure filestore 3.x cluster 2. Upgrade cluster to 4.x 3. run filestore to bluestore migration playbook Actual results: Playbook exits without failures though bluestore OSDs were not created Expected results: Playbook must fail if it doesn't create bluestore OSDs Additional info: