pgsql: Try to ensure that stats collector's receive buffer size is at l

Try to ensure that stats collector's receive buffer size is at least 100KB.

Back-patch of commit 8b0b6303e991079726e83d17401405e94da11564.

Discussion: /messages/by-id/22173.1494788088@sss.pgh.pa.us

Branch
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REL9_4_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/54676c72c91f3aa22714da49f0cbcc205e3dc5b1

Modified Files
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src/backend/postmaster/pgstat.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)

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