57892623de
NFS and Quobyte drivers no longer allow extension of an attached volume. The extend operation raises an ExtendVolumeError in the Cinder Volume service in case the volume to be extended is currently attached. This should be reverted once a a more capable solution for bug #1870367 has been found. Partial-bug: #1870367 Change-Id: Ib2a7c1cdf269b4907ff8adff1b9d900072eedde2