CLOUDSTACK-5813: With S3 as secondary storage, snapshot taken in one
zone cannot be used to create volume in another zone. zoneId parameter
in createVolumeCmd is not observed.
CLOUDSTACK-5840:Migration from NFS to S3 should be done in one API
(updateCloudToUseObjectStore) instead of two APIs.
CLOUDSTACK-5841:Snapshots taken before migration NFS to S3 can not be
used cross-zone.
CLOUDSTACK-5831: Fix NPE, in case the volume isn't attached to any pool