Enforce minimum value for volume (extend) size

volume size shouldn't be 0 or a negative value. Also, cinder does not
support shrinking volumes so extend should be apparently a positive
value.

Change-Id: I9966245063c8e3d80f50395f315c087c9c0183e6
Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>
1 file changed