swirl: ensure port range for stop_peer/1 and start_peer/1 are equivalent
message: add common_test framework
merge branch 'feature/17-test-against-pcap-traces' into develop

- use modified pcap traces within common_test
- closes #17
Merge branch 'refs/heads/develop'

* refs/heads/develop:
  message: add common_test framework
  swirl: ensure port range for stop_peer/1 and start_peer/1 are equivalent