Zero out vacuum_count and related counters in pgstat_recv_tabstat().

This fixes an oversight in commit 946045f04d11d246a834b917a2b8bc6e4f884a37
of 2010-08-21, as reported by Itagaki Takahiro.  Also a couple of minor
cosmetic adjustments.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/7193a90fc1e3ce0be7688c1452e813bd0ddc101b

Modified Files
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src/backend/postmaster/pgstat.c |   17 +++++++++++------
1 files changed, 11 insertions(+), 6 deletions(-)

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