Specify snapshot size when creating volume
Specify snapshot size when creating volume

To avoid volume creation failures due to the default size being
insuficient, specify the snapshot size when creating a volume
from a snapshot.

Closes-Bug: #1645816

Change-Id: Ib609bac7ab331a7ddf90e3d9147547658ec1b0f7

Juniper/tempest,openstack/tempest,masayukig/tempest,cisco-openstack/tempest,Juniper/tempest,masayukig/tempest,cisco-openstack/tempest,vedujoshi/tempest,openstack/tempest,vedujoshi/tempest