fix switch will forget the default link speed for unknown

For network devices those failed to retrieve the link status
will have a default value of 100Mbps FD TP at the first scan.
But during the next scan by monitor update, the default value
will be lost.

Signed-off-by: Hiroaki KAWAI <kawai@stratosphere.co.jp>
fix match comparator usage

If update_counter was true the match_key is the packet, and
the table match rule matches for that packet. On the other hand,
if update_counter was false, the match_key is match rule for
FLOW_MOD or MULTIPART FLOW stats. In that case, match_key
matches for the table match rule.

Signed-off-by: Hiroaki KAWAI <kawai@stratosphere.co.jp>
remove unnecessary assertion

During flow update opration, priority may set.
remove unnecessary assertion

During flow update opration, priority may set.
Merge pull request #34 from iHiroakiKawai/port_link_status_update

fix switch will forget the default link speed for unknown
Merge pull request #41 from iHiroakiKawai/fix_match

fix match comparator usage
fix unittests errors
update openflow.h
- rename to ofp_group_desc from ofp_group_desc_stats