Stop all neutron-ns-metadata-proxy with stop_neutron

Process name is actually python therefore neutron-ns-metadata-proxy
pattern didn't match wanted process.

Closes-bug: #1269982
Change-Id: Ib4439b0d32f103253b461841fa903c65763ff280
(cherry picked from commit 1f76328027bb5cee0b0ea7077f4c59c919f1c4ae)
Disable key injection by default.

Change-Id: Ib618da1bd21da09f8855ec4691bff79c4c3b3d9c
Backport Swift process kill

Backport https://review.openstack.org/70867 to kill all Swift services.

Change-Id: I8cc7b4058f949fa7b2872a864c305d2c33e18ad6