Rename unit tests from Quantum to Neutron

Change-Id: I1363f15636f16be9d3dee3e7b0063fbac5d2ed56
Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>
(cherry picked from commit 92be193d2c780a11c5d6d99554c368ae75d632ea)
Merge branch 'stable/havana' of https://github.com/stackforge/puppet-nova into havana