pgsql: Revert "Fix isolation test to be less timing-dependent"

Revert "Fix isolation test to be less timing-dependent"

This reverts commit 2268e6afd596.  It turned out that inconsistency in
the report is still possible, so go back to the simpler formulation of
the test and instead add an alternate expected output.

Discussion: https://postgr.es/m/20180103193728.ysqpcp2xjnqpiep7@alvherre.pgsql

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/6c8be5962aea2eee8c366c01bbbcf5bf5ddf5294

Modified Files
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src/test/isolation/expected/multiple-cic.out   | 15 +++++----------
src/test/isolation/expected/multiple-cic_1.out | 20 ++++++++++++++++++++
src/test/isolation/specs/multiple-cic.spec     | 12 ++++--------
3 files changed, 29 insertions(+), 18 deletions(-)