Add -F option to pg_receivexlog, for specifying fsync interval.

Fujii Masao <fujii@postgresql.org>

Commit: 3dad73e71f08abd86564d5090a58ca71740e07e0
Author: Fujii Masao <fujii@postgresql.org>
Date: 2014-08-08T07:50:54Z
Releases: 9.5.0
Add -F option to pg_receivexlog, for specifying fsync interval.

This allows us to specify the maximum time to issue fsync to ensure
the received WAL file is safely flushed to disk. Without this,
pg_receivexlog always flushes WAL file only when it's closed and
which can cause WAL data to be lost at the event of a crash.

Furuya Osamu, heavily modified by me.

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