simplify error message

weaver/weave

@@ -88,11 +88,11 @@ case "$COMMAND" in
         ;;
     status)
         if ! DOCKERIP=$(docker inspect --format='{{ .NetworkSettings.IPAddress }}' weave 2>/dev/null) ; then
-            echo "There is no weave container." >&2
+            echo "Weave is not running." >&2
             exit 1
         fi
         if [ -z "$DOCKERIP" ] ; then
-            echo "The weave container is not running." >&2
+            echo "Weave is not running." >&2
             exit 1
         fi
         if command_exists wget ; then