48913db887
This adjusts commit 82233ce7ea42d6ba519aaec63008aff49da6c7af so that the postmaster does not exit until all its child processes have exited, even if the 5-second timeout elapses and we have to send SIGKILL. There is no great value in having the postmaster process quit sooner, and doing so can mislead onlookers into thinking that the cluster is fully terminated when actually some child processes still survive. This effect might explain recent test failures on buildfarm member hamster, wherein we failed to restart a cluster just after shutting it down with "pg_ctl stop -m immediate". I also did a bit of code review/beautification, including fixing a faulty use of the Max() macro on a volatile expression. Back-patch to 9.4. In older branches, the postmaster never waited for children to exit during immediate shutdowns, and changing that would be too much of a behavioral change.
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