update indigo

* submodules/indigo ddd8d0e...df69e46 (2):
  > Merge into master from pull request #167: SocketManager log cleanup (https://github.com/floodlight/indigo/pull/167)
  > Merge into master from pull request #166: OFConnectionManager logging cleanup (https://github.com/floodlight/indigo/pull/166)
update loxigen-artifacts

* submodules/loxigen-artifacts af9f136...28693e7 (3):
  > Artifacts from https://github.com/floodlight/loxigen/compare/0bc0754d659361bc9fdf2a54f96e3ef36b6b2de3...3045255e245f08abd2bf45384363bd54028f4f73
  > Artifacts from https://github.com/floodlight/loxigen/compare/068d76eba4cad6c818bd2fc0fb2affdeda779ad8...0bc0754d659361bc9fdf2a54f96e3ef36b6b2de3
  > Artifacts from https://github.com/floodlight/loxigen/compare/6ff7f10d9a85b9aa2d384d633a4c3df777012dc1...068d76eba4cad6c818bd2fc0fb2affdeda779ad8
Merge into master from pull request #205:
update submodules (https://github.com/floodlight/ivs/pull/205)