Default to zdrun daemon status "on" (effectively prevents signals from...

Default to zdrun daemon status "on" (effectively prevents signals from reaching child processes).  This will prevent the symptom of killing the server when pressing ctrl-C from an interactive logtail.

Also ignore child process return statuses.  If we don't, an interactive zopectl shell can clutter up the process table with zombies after a few starts and stops.

lib/python/Zope/Startup/zopectl.py

@@ -35,6 +35,7 @@ action "help" to find out about available actions.
 
 import os
 import sys
+import signal
 
 import zdaemon
 import Zope.Startup
@@ -66,7 +67,7 @@ class ZopeCtlOptions(ZDOptions):
         ZDOptions.__init__(self)
         self.add("backofflimit", "runner.backoff_limit",
                  "b:", "backoff-limit=", int, default=10)
-        self.add("daemon", "runner.daemon", "d", "daemon", flag=1, default=0)
+        self.add("daemon", "runner.daemon", "d", "daemon", flag=1, default=1)
         self.add("forever", "runner.forever", "f", "forever",
                  flag=1, default=0)
         self.add("hang_around", "runner.hang_around", default=0)
@@ -179,6 +180,9 @@ def main(args=None):
         c.do_status()
         c.cmdloop()
 
-
 if __name__ == "__main__":
+    # we don't care to be notified of our childrens' exit statuses.
+    # this prevents zombie processes from cluttering up the process
+    # table when zopectl start/stop is used interactively.
+    signal.signal(signal.SIGCHLD, signal.SIG_IGN)
     main()