Set required devstack variables for Ironic+grenade

When sideways migrating from the fake nova driver, do not attempt to
exercise the base side of Grenade using Tempest and Javelin.  Also,
bump the number of VMs enrolled in the Ironic inventory to 3 to
facilitate Tempest concurrency.

Change-Id: I0dc1c1576ff3ff53d1de76af35e6a6f0e2738ac3

devstack-vm-gate.sh

@@ -123,6 +123,7 @@ EOF
     if [[ "$DEVSTACK_GATE_VIRT_DRIVER" == "ironic" ]]; then
         echo "VIRT_DRIVER=ironic" >>localrc
         echo "IRONIC_BAREMETAL_BASIC_OPS=True" >>localrc
+        echo "IRONIC_VM_COUNT=3" >>localrc
         echo "IRONIC_VM_EPHEMERAL_DISK=1" >>localrc
         echo "IRONIC_VM_LOG_DIR=$BASE/$LOCALRC_OLDNEW/ironic-bm-logs" >>localrc
         echo "DEFAULT_INSTANCE_TYPE=baremetal" >>localrc
@@ -200,6 +201,9 @@ EOF
         else
             echo "GRENADE_PHASE=target" >> localrc
         fi
+        # keystone deployed with mod wsgi cannot be upgraded or migrated
+        # until https://launchpad.net/bugs/1365105 is resolved.
+        echo "KEYSTONE_USE_MOD_WSGI=False" >> localrc
     else
         # Grenade needs screen, so only turn this off if we aren't
         # running grenade.
@@ -296,6 +300,14 @@ DO_NOT_UPGRADE_SERVICES=$DO_NOT_UPGRADE_SERVICES
 TEMPEST_CONCURRENCY=$TEMPEST_CONCURRENCY
 VERBOSE=False
 EOF
+
+    if [[ "$DEVSTACK_GATE_GRENADE" == "sideways-ironic" ]]; then
+        # sideways-ironic migrates from a fake environment, avoid exercising
+        # base.
+        echo "BASE_RUN_SMOKE=False" >> $BASE/new/grenade/localrc
+        echo "RUN_JAVELIN=False" >> $BASE/new/grenade/localrc
+    fi
+
     # Make the workspace owned by the stack user
     sudo chown -R stack:stack $BASE