PGSTAT start failure probably shouldn't disable Postgres

Tom Lane wrote:

We've seen several reports now of 7.2 postmasters failing to start
because of weird networking setups --- if it's impossible to create
a loopback UDP port on 127.0.0.1, 7.2 will exit with
PGSTAT: bind(2): Cannot assign requested address

It occurs to me that a more friendly behavior would be to disable
statistics gathering and proceed with startup anyway. Any objections?

Agreed. Throw an elog(LOG) and continue.

-- 
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