[v0x01] Implement Packing and Unpacking tests

[diraol]

• Asynchronous messages:
  • error_msg.py
  • flow_removed.py
  • packet_in.py
  • port_status.py
• Common messages:
  • action.py
  • flow_match.py
  • header.py
  • phy_port.py
  • queue.py
• Controller2Switch Messages
  • aggregate_stats_reply.py
  • aggregate_stats_request.py
  • barrier_reply.py
  • barrier_request.py
  • common.py
  • desc_stats.py
  • features_reply.py
  • features_request.py
  • flow_mod.py - flow_delete
  • flow_mod.py - flow_add
  • flow_stats.py
  • flow_stats_request.py
  • get_config_reply.py
  • get_config_request.py
  • packet_out.py
  • port_mod.py
  • port_stats.py
  • port_stats_request.py
  • queue_get_config_reply.py
  • queue_get_config_request.py
  • queue_stats.py
  • queue_stats_request.py
  • set_config.py
  • stats_reply.py
  • stats_request.py
  • table_stats.py
• Foundation
  • base.py
  • basic_types.py
• Symmetric messages
  • echo_reply.py
  • echo_request.py
  • hello.py
  • vendor_header.py