[reSIProcate] no Contact allowed in MESSAGE

[John Gregg]

As per RFC 3428, section 4:

MESSAGE requests do not initiate dialogs.  User Agents MUST NOT
    insert Contact header fields into MESSAGE requests.

Accordingly, I think the following change should be made to 
Dialog::makeRequest() (diff from Dialog.cxx, version 1.9.6 attached):

    request.remove(h_Contacts);
    if (method != MESSAGE) // RFC 3428, section 4: no Contact allowed in 
MESSAGE
    {
request.header(h_Contacts).push_front(mLocalContact);
    }

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