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.