Import initial BGP message model
Import initial BGP message model

Change-Id: Ife7559e7ab31098c8f4b2798e6fd679297bca626
Signed-off-by: Robert Varga <b8bd3df785fdc0ff42dd1710c5d91998513c57ef@cisco.com>

inocybe/odl-bgpcep,inocybe/odl-bgpcep,opendaylight/bgpcep,bigdataops/bgpcep,bigdataops/bgpcep