PL/Tcl: Improve trigger tests organization

Peter Eisentraut <peter@eisentraut.org>

Commit: aefcc2bba211b738b3dd3cb393d9cdfcbcdc83cd
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2019-03-15T11:42:07Z
Releases: 12.0
PL/Tcl: Improve trigger tests organization

The trigger tests for PL/Tcl were spread aroud pltcl_setup.sql and
pltcl_queries.sql, mixed with other tests, which makes them hard to
follow and edit.  Move all the trigger-related pieces to a new file
pltcl_trigger.sql.  This also makes the test setup more similar to
plperl and plpython.

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