Fix a Protobuf->ExtendedContact migration problem
Fix a Protobuf->ExtendedContact migration problem

Handle the case where Contact-URIs have been serialized as Contact headers
in Protobuf format. That implies that the Contact-URI is enclosed by
'<' and '>' characters. Such characters have to be removed before
giving the URI to the ExtendedContact constructor.

BelledonneCommunications/flexisip,BelledonneCommunications/flexisip,BelledonneCommunications/flexisip,BelledonneCommunications/flexisip