pgsql: Add regression test coverage for non-default timezone abbreviati

Add regression test coverage for non-default timezone abbreviation sets.

After further reflection about the mess cleaned up in commit 39b691f25,
I decided the main bit of test coverage that was still missing was to
check that the non-default abbreviation-set files we supply are usable.
Add that.

Back-patch to supported branches, just because it seems like a good
idea to keep this all in sync.

Branch
------
REL9_6_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/512c197b21aa86b1827bfc433f4aebc1469648fe

Modified Files
--------------
src/test/regress/expected/timestamptz.out | 15 +++++++++++++++
src/test/regress/sql/timestamptz.sql | 5 +++++
src/timezone/README | 5 +++++
3 files changed, 25 insertions(+)

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