make nova binaries use eventlet

bin/nova-volume

@@ -21,6 +21,9 @@
   Twistd daemon for the nova volume nodes.
 """
 
+import eventlet
+eventlet.monkey_patch()
+
 import os
 import sys
 
@@ -32,14 +35,8 @@ possible_topdir = os.path.normpath(os.path.join(os.path.abspath(sys.argv[0]),
 if os.path.exists(os.path.join(possible_topdir, 'nova', '__init__.py')):
     sys.path.insert(0, possible_topdir)
 
-from nova import service
-from nova import twistd
-from nova import utils
-
+from nova import service_eventlet
 
 if __name__ == '__main__':
-    utils.default_flagfile()
-    twistd.serve(__file__)
-
-if __name__ == '__builtin__':
-    application = service.Service.create()  # pylint: disable-msg=C0103
+    service_eventlet.serve()
+    service_eventlet.wait()