Fix grenade plugin

Adds settings file is necessary to register the service.
Fixes undefined reference in shutdown by copy-paste. :/

Change-Id: I1c2129d581c00719766f80b802031f04b4a07a2a
Closes-Bug: #1579235

devstack/upgrade/settings

@@ -0,0 +1 @@
+register_project_for_upgrade neutron-vpnaas

devstack/upgrade/shutdown.sh

@@ -13,7 +13,24 @@
 # under the License.
 #
 # ``upgrade-neutron-vpnaas``
+set -o errexit
 source $GRENADE_DIR/grenaderc
 source $GRENADE_DIR/functions
+source $BASE_DEVSTACK_DIR/functions
+source $BASE_DEVSTACK_DIR/stackrc  # needed for status directory
+
+# TODO(kevinbenton): figure out best way to source this from devstack plugin
+function neutron_vpnaas_stop {
+    local ipsec_data_dir=$DATA_DIR/neutron/ipsec
+    local pids
+    if [ -d $ipsec_data_dir ]; then
+        pids=$(find $ipsec_data_dir -name 'pluto.pid' -exec cat {} \;)
+    fi
+    if [ -n "$pids" ]; then
+        sudo kill $pids
+    fi
+    stop_process neutron-vpnaas
+}
+ENABLED_SERVICES+=,neutron-vpnaas
 set -o xtrace
-neutron_vpnaas_stop
+neutron_vpnaas_stop