Use a non-zero exitcode on errors in scripts

When a worker can't connect to Redis, return
a non-zero exit code so supervisor processes
can act accordingly.

rq/scripts/rqinfo.py

@@ -174,3 +174,4 @@ def main():
         interval(args.interval, func, args)
     except ConnectionError as e:
         print(e)
+        sys.exit(1)

rq/scripts/rqworker.py

@@ -66,3 +66,4 @@ def main():
         w.work(burst=args.burst)
     except ConnectionError as e:
         print(e)
+        sys.exit(1)