ofproto-dpif: Differentiate between different miss types in packet in

ofproto-dpif: Differentiate between different miss types in packet in

Replace the generated_by_table_miss field of struct ofproto_packet_in
with a miss_type field.

The generated_by_table_miss field allowed packet-in messages generated
by table-miss rules to be differentiated. This differentiation
is still provided for by miss_type being set to OFPROTO_PACKET_IN_MISS_FLOW.

This patch allows further differentiation by setting miss_type
to OFPROTO_PACKET_IN_MISS_WITHOUT_FLOW if the packet-in message
is generated by a table-miss which is not handled by a table-miss rule.

This is in preparation for OpenFlow 1.3 version-specific
handling of the default action for such misses.

Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Ben Pfaff <blp@nicira.com>