Add an entrypoints to launch oslo.metrics

Change-Id: I0d5fab019f8befb52cd07628006edcb2af8e6473

oslo_metrics/__main__.py

@@ -69,7 +69,8 @@ class MetricsListener():
         self.socket.close()
         self.start = False
 
-if __name__ == "__main__":
+
+def main():
     cfg.CONF(sys.argv[1:])
     m = MetricsListener(cfg.CONF.oslo_metrics.metrics_socket_file)
     mt = threading.Thread(target=m.serve)
@@ -87,3 +88,7 @@ if __name__ == "__main__":
         os.remove(cfg.CONF.oslo_metrics.metrics_socket_file)
         m.stop()
         httpd.server_close()
+
+
+if __name__ == "__main__":
+    main()

setup.cfg

@@ -23,4 +23,8 @@ classifier =
 
 [files]
 packages =
-    oslo_metrics
+    oslo_metrics
+
+[entry_points]
+console_scripts =
+    oslo-metrics = oslo_metrics.__main__:main