Обсуждение: pgsql: Disable one set of tests from c8841199509.

Disable one set of tests from c8841199509.

One of the upsert related tests is unstable (sometimes even hanging
until isolationtester's step timeout is reached). Based on preliminary
analysis that might be a problem outside of just that test, but not
really related to EPQ and triggers.  Disable for now, to get the
buildfarm greener again.

Discussion: https://postgr.es/m/20191004222437.45qmglpto43pd3jb@alap3.anarazel.de
Backpatch: 9.6-, just like c8841199509.

Branch
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REL_11_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/5711a1828f1fd1b120d0faa62f47ad5a5fe5632c

Modified Files
--------------
.../isolation/expected/eval-plan-qual-trigger.out  | 217 ---------------------
.../isolation/specs/eval-plan-qual-trigger.spec    |  21 +-
2 files changed, 11 insertions(+), 227 deletions(-)