Add isolation test for SERIALIZABLE READ ONLY DEFERRABLE.

Kevin Grittner <kgrittn@postgresql.org>

Commit: 4deb413813f619b3e859abf435b61efc09cafe09
Author: Kevin Grittner <kgrittn@postgresql.org>
Date: 2017-04-05T15:04:36Z
Releases: 10.0
Add isolation test for SERIALIZABLE READ ONLY DEFERRABLE.

This improves code coverage and lays a foundation for testing
similar issues in a distributed environment.

Author: Thomas Munro <thomas.munro@enterprisedb.com>
Reviewed-by: Michael Paquier <michael.paquier@gmail.com>

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