wip: [stix2 import] Network traffic references parsing function for further reuse
wip: [stix2 import] Network traffic references parsing function for further reuse

MISP/MISP,SteveClement/MISP,MISP/MISP,SteveClement/MISP,SteveClement/MISP,MISP/MISP,SteveClement/MISP,SteveClement/MISP,MISP/MISP,MISP/MISP