[utils/kafka] provide some exit code from main

utils/kafka/consume.py

@@ -34,6 +34,7 @@ def main():
     pprint(client.poll(10000))
     client.unsubscribe()
     client.close()
+    return 0
 
 
 if __name__ == "__main__":

utils/kafka/manage.py

@@ -35,6 +35,7 @@ def main():
         print(client.delete_topics(args.delete))
 
     client.close()
+    return 0
 
 
 if __name__ == "__main__":

utils/kafka/produce.py

@@ -77,6 +77,7 @@ def send(num):
 
     client.flush()
     client.close()
+    return 0
 
 
 if __name__ == "__main__":

utils/kafka/status.py

@@ -5,7 +5,6 @@
 import kafka  # … kafka-python
 
 import argparse
-from pprint import pprint
 
 
 def main():
@@ -46,6 +45,7 @@ def main():
         consumer.close()
 
     client.close()
+    return 0
 
 
 if __name__ == "__main__":