Fix isolation test to be less timing-dependent

I did this by adding another locking process, which makes the other two
wait.  This way the output should be stable enough.

Per buildfarm and Andres Freund
Discussion: 
https://postgr.es/m/[email protected]

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/2268e6afd59649d6bf6d114a19e9c492d59b43fc

Modified Files
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src/test/isolation/expected/multiple-cic.out | 17 +++++++++++------
src/test/isolation/specs/multiple-cic.spec   | 12 ++++++++----
2 files changed, 19 insertions(+), 10 deletions(-)

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