pgsql: Warn about initdb using mount-points

Warn about initdb using mount-points

Add code to detect and warn about trying to initdb or create pg_xlog on
mount points.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/17f15239325a88581bb4f9cf91d38005f1f52d69

Modified Files
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src/bin/initdb/initdb.c | 51 +++++++++++++++++++++++++-------
src/bin/pg_basebackup/pg_basebackup.c | 2 +
src/port/pgcheckdir.c | 20 +++++++++++-
3 files changed, 60 insertions(+), 13 deletions(-)

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