upate indigo
upate indigo

* submodules/indigo 04949e4...1806dec (1):
  > Merge into master from pull request #81: OFStateManager: promote listeners to Indigo architecture headers (https://github.com/floodlight/indigo/pull/81)

floodlight/switchlight-common,floodlight/switchlight-common,floodlight/switchlight-common