pgsql: Fix display of log duration so it is milliseconds.microseconds

Log Message:
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Fix display of log duration so it is milliseconds.microseconds "ms".

Greg Sabino Mullane

Modified Files:
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pgsql/src/backend/tcop:
postgres.c (r1.496 -> r1.497)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/tcop/postgres.c.diff?r1=1.496&r2=1.497)