Implement ability to extend volume.

Implements ability to call extend volume in Version 2 API.

This change includes the needed support in cinderlcient to
utilize/access changes made in the volume-resize change.

Change-Id: Ifc7e2969b885a60e8105b5f3908ac452d0a61fa7
Enable ability to reset state on snapshots.

Implement the ability to reset-state on snapshots,
exposes os-reset_status from snapshot actions.

Change-Id: I605f41e39fde46ccfe6a53222b798f32c14bc1f8
Merge "Implement ability to extend volume."
Merge "Enable ability to reset state on snapshots."