noVNC master no longer stable/folsom compatible

Change-Id: I06ac432ffd6ec82fa1c6a994ebdadc375c0f8f1e
Fixes: bug #1083189
nova-manage network commands only when n-net enabled

This patch checks if n-net is enabled rather than any nova service
before creating networks through nova. Fixes bug 1073313

Change-Id: I8810737ddbb26a5e281060f5395cfad5d186b6d3
Use apt git package instead of git-core.

The git-core package is deprecated in favor of the git package. Use the
git package instead.

Change-Id: Ib136e34c7a0d4f87b02e32996420b3f507ca0bf4
Properly wait until volumes are gone in volumes.sh

A logic error in volume exercise's wait for volume deletion
causes the test to do the opopsite, and continue on even tho
the volume is in in the 'deleting' state.  If using a volume
backend that can quickly delete volumes (ceph), and the volume
is gone before entering the wait, the loop will spin, timeout
and fail the test.

Change-Id: I8e3d2aaa04e6a165e0dee32bedac97d35e13d5eb
(cherry picked from commit 756c842a7743a84a084b4cc211998e3fdd171592)
Merge remote-tracking branch 'origin/stable/folsom' into folsom