Fix openstack netvirt sfc suite

Fix openstack netvirt sfc suite

typo in instance creation s/groups/group

migrate some neutron cli to the openstack cli

also, since I was here, I moved all of the cleanup steps
out of their own individual test cases and into a suite
teardown keyword. This lets robot run through every step
regardless if any previous step had failed. If left in a
test case, robot bails on the test case and wont run any
other steps in that test case if any single step fails.

Change-Id: Iea009efbe2c7633bc83898002b2a6decd08f24aa
Signed-off-by: Jamo Luhrsen <jluhrsen@redhat.com>