[reSIProcate] Added new RequestValidationHandler to DUM on trunk

[Francis Joanis]

Hi,

I've added a new handler that enables DUM applications to know when an
incoming request is rejected because of a failed validation.

For example, onInvalidMethod(const SipMessage& request) will be called on
the registered handler if a request is received with an unsupported SIP
method.

The default behavior is to have no such handler. You can register your
handler using DialogUsageManager::setRequestValidationHandler.

I've also added a testRequestValidationHandler test (under dum/test) that
shows how to use it (note that not all callbacks are tested in there).

Please let me know if you have any comment.

Regards,
Francis
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