pgsql: Fix base backup rate limiting in presence of slow i/o

Fix base backup rate limiting in presence of slow i/o

When source i/o on disk was too slow compared to the rate limiting
specified, the system could end up with a negative value for sleep that
it never got out of, which caused rate limiting to effectively be
turned off.

Discussion: /messages/by-id/CABUevEy_-e0YvL4ayoX8bH_Ja9w+BHoP6jUgdxZuG2nEj3uAfQ@mail.gmail.com

Analysis by me, patch by Antonin Houska

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/10238fad0389175f71739bc9b4d00bb24d9b8c44

Modified Files
--------------
src/backend/replication/basebackup.c | 24 +++++++-----------------
1 file changed, 7 insertions(+), 17 deletions(-)

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