Dragonflow db CLI addition
Dragonflow db CLI addition

To support removing the Dragonflow database table items. If the Dragonflow db
is inconsistent with Neutron db when testing, we can consider removing the
stale db record manually with this rm command.

Change-Id: I0f4b863249b509cd418b66049447c4d98c7fd5ab

FrankDuan/df_code,openstack/dragonflow,openstack/dragonflow,FrankDuan/df_code,FrankDuan/df_code,openstack/dragonflow