update indigo
update indigo

* submodules/indigo 67c0e99...8356f8b (1):
  > Merge into master from pull request #57: update loci to c4da04db638135e618763773bd03371db1c9b7fd (https://github.com/floodlight/indigo/pull/57)

This brings in the new BSN OXMs.

vezril/ivs,harshsin/ivs,harshsin/ivs,vezril/ivs,floodlight/ivs,floodlight/ivs,vezril/ivs,floodlight/ivs,harshsin/ivs,harshsin/ivs