feat(xenial_builds): Add Systemd configuration for parent service (#776)

* feat(xenial_builds): Add Systemd configuration for parent service to
start and stop all spinnaker services.

halyard-deploy/src/main/resources/debian/init.sh

@@ -1,19 +1,34 @@
-cat > /etc/init/spinnaker.conf <<EOL
-description "spinnaker"
+source /etc/os-release
 
+if [ "$VERSION_ID" = "14.04" ]; then
+  cat > /etc/init/spinnaker.conf <<EOL
+description "spinnaker"
 start on filesystem or runlevel [2345]
 stop on shutdown
-
 pre-start script
-
   for i in {%services%}
   do
     if [ ! -d "/var/log/spinnaker/\$i" ]; then
       echo "/var/log/spinnaker/\$i does not exist. Creating it..."
       install --mode=755 --owner=spinnaker --group=spinnaker --directory /var/log/spinnaker/\$i
     fi
-
     service \$i start
   done
 end script
 EOL
+elif [ "$VERSION_ID" = "16.04" ]; then
+  cat > /lib/systemd/system/spinnaker.service <<EOL
+[Unit]
+Description=All Spinnaker services
+After=network.target
+Wants=gate.service orca.service clouddriver.service front50.service rosco.service igor.service echo.service fiat.service
+
+[Service]
+Type=oneshot
+ExecStart=/bin/true
+RemainAfterExit=yes
+
+[Install]
+WantedBy=multi-user.target
+EOL
+fi