Apply more consistent style for command options in TAP tests

This commit reshapes the grammar of some commands to apply a more
consistent style across the board, following rules similar to
ce1b0f9da0:
- Elimination of some pointless used-once variables.
- Use of long options, to self-document better the options used.
- Use of fat commas to link option names and their assigned values,
including redirections, so as perltidy can be tricked to put them
together.

Author: Dagfinn Ilmari Mannsåker <ilmari@ilmari.org>
Discussion: https://postgr.es/m/87jz8rzf3h.fsf@wibble.ilmari.org

contrib/auto_explain/t/001_auto_explain.pl

@@ -28,7 +28,7 @@ sub query_log
 }
 
 my $node = PostgreSQL::Test::Cluster->new('main');
-$node->init('auth_extra' => [ '--create-role', 'regress_user1' ]);
+$node->init('auth_extra' => [ '--create-role' => 'regress_user1' ]);
 $node->append_conf('postgresql.conf',
 	"session_preload_libraries = 'auto_explain'");
 $node->append_conf('postgresql.conf', "auto_explain.log_min_duration = 0");

contrib/basebackup_to_shell/t/001_basic.pl

@@ -131,8 +131,10 @@ sub verify_backup
 
 		# Untar.
 		my $extract_path = PostgreSQL::Test::Utils::tempdir;
-		system_or_bail($tar, 'xf', $backup_dir . '/' . $prefix . 'base.tar',
-			'-C', $extract_path);
+		system_or_bail(
+			$tar,
+			'xf' => $backup_dir . '/' . $prefix . 'base.tar',
+			'-C' => $extract_path);
 
 		# Verify.
 		$node->command_ok(

contrib/sepgsql/t/001_sepgsql.pl

@@ -216,8 +216,7 @@ $node->append_conf('postgresql.conf', 'log_statement=none');
 			'-D' => $node->data_dir,
 			'template0'
 		],
-		'<',
-		$ENV{share_contrib_dir} . '/sepgsql.sql');
+		'<' => $ENV{share_contrib_dir} . '/sepgsql.sql');
 	ok($result, 'sepgsql installation script');
 }