Allow isolation tests to specify multiple setup blocks.

Each setup block is run as a single PQexec submission, and some
statements such as VACUUM cannot be combined with others in such a
block.

Backpatch to 9.2.

Kevin Grittner and Tom Lane

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/c63f309cca07c0570494a8f36092633635990db8

Modified Files
--------------
src/test/isolation/README            |    8 ++++++--
src/test/isolation/isolationtester.c |    4 ++--
src/test/isolation/isolationtester.h |    3 ++-
src/test/isolation/specparse.y       |   28 +++++++++++++++++++++++++---
4 files changed, 35 insertions(+), 8 deletions(-)

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