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

src/interfaces/libpq/t/001_uri.pl

@@ -268,8 +268,9 @@ sub test_uri
 	%ENV = (%ENV, %envvars);
 
 	my $cmd = [ 'libpq_uri_regress', $uri ];
-	$result{exit} = IPC::Run::run $cmd, '>', \$result{stdout}, '2>',
-	  \$result{stderr};
+	$result{exit} = IPC::Run::run $cmd,
+	  '>' => \$result{stdout},
+	  '2>' => \$result{stderr};
 
 	chomp($result{stdout});
 	chomp($result{stderr});

src/interfaces/libpq/t/005_negotiate_encryption.pl

@@ -673,7 +673,9 @@ sub connect_test
 	my ($ret, $stdout, $stderr) = $node->psql(
 		'postgres',
 		'',
-		extra_params => [ '-w', '-c', 'SELECT current_enc()' ],
+		extra_params => [
+			'--no-password', '--command' => 'SELECT current_enc()',
+		],
 		connstr => "$connstr_full",
 		on_error_stop => 0);