pg_resetwal: Add simple test suite

Some subsequent patches will add to this, but to avoid conflicts, set up
the basics separately.

src/bin/pg_resetwal/.gitignore

 /pg_resetwal
+/tmp_check/

src/bin/pg_resetwal/Makefile

@@ -33,3 +33,10 @@ uninstall:
 
 clean distclean maintainer-clean:
 	rm -f pg_resetwal$(X) $(OBJS)
+	rm -rf tmp_check
+
+check:
+	$(prove_check)
+
+installcheck:
+	$(prove_installcheck)

src/bin/pg_resetwal/t/001_basic.pl

+use strict;
+use warnings;
+
+use PostgresNode;
+use TestLib;
+use Test::More tests => 11;
+
+program_help_ok('pg_resetwal');
+program_version_ok('pg_resetwal');
+program_options_handling_ok('pg_resetwal');
+
+my $node = get_new_node('main');
+$node->init;
+
+command_like([ 'pg_resetwal', '-n', $node->data_dir ],
+			 qr/checkpoint/,
+			 'pg_resetwal -n produces output');