pgsql: Reduce the chatter to the log when starting a standby server.

Log Message:
-----------
Reduce the chatter to the log when starting a standby server. Don't
echo all the recovery.conf options. Don't emit the "initializing
recovery connections" message, which doesn't mean anything to a user.
Remove the "starting archive recovery" message and replace the
"automatic recovery in progress" message with a more informative message
saying whether the server is doing PITR, normal archive recovery, or
standby mode.

Modified Files:
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pgsql/src/backend/access/transam:
xlog.c (r1.372 -> r1.373)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/transam/xlog.c?r1=1.372&r2=1.373)