Milter-greylist

Hello,

When I stop the mg with "/etc/init.d/milter-greylist stop" command
on my Centos system I never got clean greylist.db dump.
There is always greylist.db-XXXXXX temporary file left over,
and the actual dump is from a previous dump event.

It looks like that the mg requires on my system (actually quiet
performant)
more than the default 3 seconds to finish writing the dump.
(The killproc sends shortly after the TERM signal a KILL
signal to the process)

I wanted to make the delay for the hard stop to be customizable,
so please include the patch attached, may be useful for others.

I changed the default value of the delay to be 5 seconds,
but this can be changed as specifying different value
for the hardstopdelay variable in the /etc/sysconfig/milter-greylist
file.

Bests,
Attila