Disable deprecation warning on String.lowercase
Disable deprecation warning on String.lowercase

This should be replaced by String.lowercase_ascii,
but that wouldn't compile with 4.02.3 anymore.
Asking everyone to upgrade to 4.04.2 might be too early for now.

Signed-off-by: Edwin Török <c8d178016cbaf8a6ef23c2cbc9db96123c48b7dc@citrix.com>

xapi-project/message-switch,xapi-project/message-switch,xapi-project/message-switch