pgsql: Fix startup so that log prefix %h works for the log_connections

Fix startup so that log prefix %h works for the log_connections message.

We entirely randomly chose to initialize port->remote_host just after
printing the log_connections message, when we could perfectly well do it
just before, allowing %h and %r to work for that message.  Per gripe from
Artem Tomyuk.

Branch
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REL9_4_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/2b3983158726be1b2494208786506dfccd900d47

Modified Files
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src/backend/postmaster/postmaster.c |   14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)