pg_ctl default shutdown mode

Now that waiting for shutdown is the default, it seems that the default
shutdown mode should also be one where there's a high chance of the
shutdown actually happening.  As it stands, if there are connected
clients, pg_ctl will wait for 60 or so seconds before proclaiming that the
postmaster won't shut down.  This is not intuitive.

The signal is still delivered, though, so the postmaster may silently shut
down at any later time.  This can cause confusion.

While the "smart" shutdown is a cute feature, a *stop* script should
really stop the thing by default and allow the unusual behaviour to be
selected with an option.

-- 
Peter Eisentraut      peter_e@gmx.net       http://yi.org/peter-e/