fix: [stix2 import] Fixed some observable and pattern parsing issues
fix: [stix2 import] Fixed some observable and pattern parsing issues

- Quick custom property in pattern parsing fixed
- Fixed file and network socket observable objects
  parsing

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