[pgpool-hackers: 1798] Change default value of fail_over_on_backend_error

[Tatsuo Ishii]

Currently the default value for fail_over_on_backend_error is on. I am
tired of complains from users who claims that temporarily error could
easily cause fail over. I personally think that they should fix their
problems first but I hope changing the fault value of
fail_over_on_backend_error to off would minimize such that complains.

If there's no objection, I will apply the change to master branch.

Best regards,
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp