Enable quantum-netns-cleanup to receive force as cli parameter

Fixes bug 1180767

Change-Id: Icd58fbe995129806426b70ea54d98f213988dbe5
(cherry picked from commit 7c82107f0aaee3e8624e3b3baddfe09b96b9d804)
Merge "Enable quantum-netns-cleanup to receive force as cli parameter" into stable/grizzly