Found some more issue.
1. restarting cinder-volume before ceph cluster is full-up, causes RBD
  driver to be uninitialized and future volumes created will go to error
  state.
  FIX: So added check for all OSD to be up before storage-openstack
   configuration and relevant changes to contrail_storage.pp
2. missed a check for RETVAL of command while live-migration configuration

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Fix check for directory existance.

Change-Id: I66d42ac37b80b784557781ec8404aa3275244f05