Change packet ownership strategy to avoid cloning packet in groups.
Fix a double free in group of type all with new packet freeing strategy.
Add TUNNEL_ID to set_field action.

Implements the the tunnel id set_field action, enabling
matching on this field after the action.
Also fix a little bug when checking if the tunnel_id field value
already exists.
Fix OXM_SCTP_DST print
Fix malloc being called twice on reply_port and reply_queue unpack messages
Change tunnel_id from network to host byte order.

Without these changes, flows were being added incorrectly.
Fix search packe_handle validate search for tunnel_id.

The previous code was searching for OXM_METADATA, leading
to erroneous tunnel_id overwriting.
Change IPv6 flow label and traffic class parsing.

This commit changes the parsing specification of the fields:
version, traffic class and flow label. Now they are parsed as
only one field on customnetpdl.