NLSR

Currently, FaceUri is canonized in Nlsr class. It is intertwined with Nlsr::initialize function as Canonization needs to happen before we call initialize. We can instead simplify this by doing the canonization in conf file processor as we read in the neighbors and let the user know if the canonization fails and do not start Nlsr. As of now we simply log an error if the canonization fails for any uri and move on.