Emiliname pychecker warning by turning NETS_1918 into a class to avoid initialization code kicking in on every import.
Emiliname pychecker warning by turning NETS_1918 into a class to avoid
initialization code kicking in on every import.

dsanders11/rtpproxy,dsanders11/rtpproxy,sippy/rtp_cluster,synety-jdebp/rtpproxy,synety-jdebp/rtpproxy,jevonearth/rtpproxy,jevonearth/rtpproxy,sippy/rtpproxy,synety-jdebp/rtpproxy,sippy/rtpproxy,synety-jdebp/rtpproxy,sippy/rtp_cluster,jevonearth/rtpproxy,jevonearth/rtpproxy,dsanders11/rtpproxy,sippy/rtpproxy