pgsql: pg_waldump: Fix invalid option handling

pg_waldump: Fix invalid option handling

Previously, running pg_waldump with an invalid option (pg_waldump
--foo) would print the help output and exit successfully. This was
because it tried to process the option letter '?' as a normal option,
but that letter is used by getopt() to report an invalid option.

To fix, process help and version options separately, like we do
everywhere else. Also add a basic test suite for pg_waldump and run
the basic option handling tests, which would have caught this.

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/f65eced25118aab29804debc4e0b9a67f4d043ad

Modified Files
--------------
src/bin/pg_waldump/.gitignore | 3 +++
src/bin/pg_waldump/Makefile | 7 +++++++
src/bin/pg_waldump/pg_waldump.c | 25 ++++++++++++++++---------
src/bin/pg_waldump/t/001_basic.pl | 8 ++++++++
4 files changed, 34 insertions(+), 9 deletions(-)