pgsql: Various temporary slots test improvements

Various temporary slots test improvements

Fix the tests on slow machines (per buildfarm).

Add test for dropping on error. And also try to consume real changes
from temporary slots.

From: Petr Jelinek <petr.jelinek@2ndquadrant.com>

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/fdf71389dd5da949cb305ace9a0347d50ef0f020

Modified Files
--------------
contrib/test_decoding/expected/slot.out | 55 ++++++++++++++++++++++++++-------
contrib/test_decoding/sql/slot.sql | 32 ++++++++++++++++---
2 files changed, 71 insertions(+), 16 deletions(-)

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