Open Stack

I'm working on the external devstack plugin for neutron-lbaas and found that it was leaving behind stale ip network namespaces after running clean.sh.  Comparing to unstack.sh, which calls "run_phase unstack" I saw that clean.sh was not calling "run_phase clean", and thus my cleanup code wasn't running.  I just submitted https://review.openstack.org/157856 that adds this to clean.sh.  Please have a look.

Thanks,

Al