[COMMITTERS] pgsql: Accept that server might not be able to send error in crashreco

Accept that server might not be able to send error in crash recovery test.

As it turns out we can't rely that the script's monitoring session is
terminated with a proper error by the server, because the session
might be terminated while already trying to send data.

Also improve robustness and error reporting facilities of the test,
developed while debugging this issue.

Discussion: https://postgr.es/m/20170920020038.kllxgilo7xzwmtto@alap3.anarazel.de

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/5ada1fcd0c30be1b0b793a802cf6da386a6c1925

Modified Files
--------------
src/test/recovery/t/013_crash_restart.pl | 98 ++++++++++++++++++++++++--------
1 file changed, 74 insertions(+), 24 deletions(-)


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