Openstack nova novnc-proxy services uses websockify to provide support for nova

vms using novnc proxy. At present, novnc hangs every couple of weeks. It only
resumes post restart of the novnc-proxy which is not good. Hence, this code in
websockify is updated to get rid of additional signal calls to avoid novnc
going in hang state even though process is running. Basically, we are getting
rid of existing msg and msg calls in the websocket.py. This is kind of quick
fix but we will need an additional way of figuring out the logging to make it
easy to trace in case of any further failures in future.

closes bug: https://github.com/kanaka/noVNC/issues/556

websockify/websocket.py

@@ -895,11 +895,14 @@ class WebSocketServer(object):
         raise self.Terminate()
 
     def multiprocessing_SIGCHLD(self, sig, stack):
-        self.vmsg('Reaping zombies, active child count is %s', len(multiprocessing.active_children()))
+        # TODO: figure out a way to actually log this information without
+        #       calling `log` in the signal handlers
+        multiprocessing.active_children()
 
     def fallback_SIGCHLD(self, sig, stack):
         # Reap zombies when using os.fork() (python 2.4)
-        self.vmsg("Got SIGCHLD, reaping zombies")
+        # TODO: figure out a way to actually log this information without
+        #       calling `log` in the signal handlers
         try:
             result = os.waitpid(-1, os.WNOHANG)
             while result[0]:
@@ -909,11 +912,13 @@ class WebSocketServer(object):
             pass
 
     def do_SIGINT(self, sig, stack):
-        self.msg("Got SIGINT, exiting")
+        # TODO: figure out a way to actually log this information without
+        #       calling `log` in the signal handlers
         self.terminate()
 
     def do_SIGTERM(self, sig, stack):
-        self.msg("Got SIGTERM, exiting")
+        # TODO: figure out a way to actually log this information without
+        #       calling `log` in the signal handlers
         self.terminate()
 
     def top_new_client(self, startsock, address):