Change RPC cleanup ordering
Change RPC cleanup ordering

RPC cleanup should occur before killing service threadgroup.
Otherwise, the connection pool is going to be (attempted) emptied
after the thread has been killed.

Change-Id: Ie2b2aca495928b7ba39b2175202a072b3592ad72
Signed-off-by: Jeff Peeler <d776211e63e47e40d00501ffdb86a800e0782fea@redhat.com>

citrix-openstack-build/oslo.service,poznyakandrey/oslo.service,eezhova/oslo.service,openstack/oslo.service