Raise VolumeNotFound with correct volume_id

Make sure VolumeNotFound is raised with the correct volume_id
in the SolidFire driver. Some exceptions were wrongfully referring
to an undefined variable named uuid.

Fixes: bug #1182966
Change-Id: Ied101fc9778f51dfb74b39f466c2c13d6e775a40
Added test for nonnumerical limit param

Change-Id: Ie9ef0b2ddcf9945f4065e76fddba763470ffdb81
Added a test for bad limit param

Change-Id: Ic9a93779d5623644ccf210de622d59f999571dd2
Update log.py and jsonutils.py from oslo-incubator

The update of log was mostly to get coloring to work again
in devstack, and jsonutils was picked up as well.

The update to jsonutils also requires the six dependency
which is added to pip-requires.

Change-Id: I95d23aafe19b12d4a427149aa5f7a66394d178c6
Merge "Added test for nonnumerical limit param"
Merge "Added a test for bad limit param"