Correct initscript order and mongod detection

In addition to starting and stopping mongod in the correct order, the check for
determining whether mongod is required needs to happen when the service is
managed.

tools/scripts/ansible-tower-service

@@ -13,16 +13,29 @@ fi
 service_action() {
     SERVICES=$TOWER_SERVICES
 
-    # Should MongoDB be managed by this script?
-    # We only manage MongoDB if the license uses it.
-    tower-manage uses_mongo
-    if [ $? == 0 && ${1} == start ]; then
-        SERVICES="$SERVICES mongod"
-    elif [ $? == 0 && ${1} == stop ]; then
-        SERVICES="mongod $SERVICES"
-    fi
+    # When determining whether mongod is required, postgres is required.  The
+    # following ensures mongod is started after postgres, and stopped before
+    # postgres.
+    case ${1} in
+        start|status)
+            SERVICES="$SERVICES mongod"
+            ;;
+        stop)
+            SERVICES="mongod $SERVICES"
+            ;;
+    esac
 
     for svc in ${SERVICES}; do
+
+        # Determine whether mongod is needed
+        if [[ ${svc} == mongod ]]; then
+            tower-manage uses_mongo 2> /dev/null >/dev/null
+            # if mongod is not required, break
+            if [ $? -ne 0 ]; then
+                break
+            fi
+        fi
+
         service ${svc} $1
         this_return=$?
         if [ $this_return -gt $worst_return ]; then