Merge pull request #739 from simplesamlphp/tvdijen-patch-1

Update and rename default-enable to default-disable

modules/sqlauth/default-enable → modules/sqlauth/default-disable

 This file indicates that the default state of this module
-is enabled. To disable, create a file named disable in the
+is disabled. To enable, create a file named enable in the
 same directory as this file.