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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master

Details
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https://git.postgresql.org/pg/commitdiff/6e61d75f5258dc395c131ad5edd712852e29939e

Modified Files
--------------
.../isolation/expected/eval-plan-qual-trigger.out  | 219 +--------------------
.../isolation/specs/eval-plan-qual-trigger.spec    |  21 +-
2 files changed, 13 insertions(+), 227 deletions(-)