Bug#627339: init script should use QUIT instead of TERM

[Steven Kurylo]

Package: cyrus-common-2.4
Version: 2.4.8-7

install-configure.html says we should use QUIT first:

Since a clean shutdown may never finish if a child process is stuck
for some reason the recommended approach is to send a SIGQUIT then loop
on the master process sending a signal 0 every second until either the
master process has gone away or a suitable time has expired (maybe 10
seconds).  You can then send a SIGTERM if the process still exists.

As well imapd.conf says sync_shutdown_file should be used if we're doing 
replication.

I've attached a first draft of a patch.  Please let me know what you 
think.  Thank you.

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