fix zombie processes

Temporary fix for zombie processes.

console/novncd

@@ -5,6 +5,9 @@ import sys
 import logging
 import django
 
+import signal
+signal.signal(signal.SIGCHLD, signal.SIG_IGN)
+
 DIR_PATH = os.path.dirname(os.path.abspath(__file__))
 ROOT_PATH = os.path.abspath(os.path.join(DIR_PATH, "..", ""))
 os.environ.setdefault("DJANGO_SETTINGS_MODULE", "webvirtcloud.settings")