Enable nova multi host on aiopcpu tests

Nova multi host is not something we can test in the normal all in one
devstack + tempest tests. Configure multi host on the 2 node devstack
and tempest test setups to cover this code.

Change-Id: I334c525c3678a230a197f0536e9d182f97ed7411

devstack-vm-gate.sh

@@ -82,7 +82,7 @@ function setup_localrc {
             if [[ "$DEVSTACK_GATE_NEUTRON" -eq "1" ]]; then
                 MY_ENABLED_SERVICES="q-agt,n-cpu,ceilometer-acompute"
             else
-                MY_ENABLED_SERVICES="n-cpu,ceilometer-acompute"
+                MY_ENABLED_SERVICES="n-cpu,n-net,ceilometer-acompute"
             fi
         fi
 
@@ -455,10 +455,12 @@ else
             cat <<EOF >>"$BASE/new/devstack/sub_localrc"
 FLAT_INTERFACE=flat_if
 PUBLIC_INTERFACE=pub_if
+MULTI_HOST=True
 EOF
             cat <<EOF >>"$BASE/new/devstack/localrc"
 FLAT_INTERFACE=flat_if
 PUBLIC_INTERFACE=pub_if
+MULTI_HOST=True
 EOF
         fi
     fi