OFStateManager: maintain checksum buckets per table
OFStateManager: handle OF_BSN_FLOW_CHECKSUM_BUCKET_STATS_REQUEST
OFStateManager: handle OF_BSN_TABLE_CHECKSUM_STATS_REQUEST
OFStateManager: handle OF_BSN_TABLE_SET_BUCKETS_SIZE
OFStateManager: fix check for invalid table id
Merge remote-tracking branch 'origin/master' into flow-checksum
Merge into master from pull request #95:
implement bsn_flow_checksum extension (https://github.com/floodlight/indigo/pull/95)