initdb pg_basebackup: Rename --noxxx options to --no-xxx

--noclean and --nosync were the only options spelled without a hyphen,
so change this for consistency with other options.  The options in
pg_basebackup have not been in a release, so we just rename them.  For
initdb, we retain the old variants.

Vik Fearing and me

src/test/perl/PostgresNode.pm

@@ -484,7 +484,7 @@ sub backup
 
 	print "# Taking pg_basebackup $backup_name from node \"$name\"\n";
 	TestLib::system_or_bail('pg_basebackup', '-D', $backup_path, '-p', $port,
-		'-x', '--nosync');
+		'-x', '--no-sync');
 	print "# Backup finished\n";
 }