add bsn_time extension

This extension allows the controller to get a timestamp from the switch. This
will differ from the controller's time due to network latency, TCP queueing,
and queuing in the switch software.
Fix name mismatch
Merge branch 'master' of github.com:ronaldchl/loxigen
Merge into master from pull request #130:
Fix name mismatch for BSN_IN_PORTS_128 (https://github.com/floodlight/loxigen/pull/130)
loci: add time_ms show macro
Merge into master from pull request #124:
add bsn_time extension (https://github.com/floodlight/loxigen/pull/124)
openflow_input: fix of_group_desc_stats_entry.group_type

use enum ofp_group_type for consistency with the group_mod messages
Merge branch 'master' of github.com:floodlight/loxigen