Run neutron in parallel

Our CentOS builds for Neutron are taking quite some time with the
containers running in serial, this patch moves to build these in
parallel for role testing.

Change-Id: I07b5b0914da340122a85723e7fdb0e1c512578c7

test-install-neutron.yml

@@ -90,20 +90,7 @@
 
 
 - name: Deploy neutron server
-  hosts: neutron_server
-  user: root
-  become: true
-  gather_facts: true
-  any_errors_fatal: true
-  roles:
-    - role: "os_neutron"
-  vars_files:
-    - test-vars.yml
-
-
-
-- name: Deploy the rest of neutron
-  hosts: "neutron_all:!neutron_server"
+  hosts: neutron_all
   user: root
   become: true
   gather_facts: true