Apply patch for test_fsync to add tests for O_DIRECT.

Adjusted patch by Josh Berkus

Branch
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master

Details
-------
http://git.postgresql.org/gitweb?p=postgresql.git;a=commitdiff;h=677b06ca462ec6fd98da9369a2eae6085c9d7fed

Modified Files
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src/tools/fsync/Makefile     |    4 +-
src/tools/fsync/README       |   21 +++-
src/tools/fsync/test_fsync.c |  256 ++++++++++++++++++++++++++++++++++++++----
3 files changed, 249 insertions(+), 32 deletions(-)

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Next:	From: Bruce Momjian	Date: 2011-01-15 17:24:37
	Subject: pgsql: Improve output display of test_fsync.
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	Subject: pgsql: Treat a WAL sender process that hasn't started streaming yetas