update loxigen-artifacts
update loxigen-artifacts

* submodules/loxigen-artifacts 4067b8e...198733a (1):
  > Artifacts from https://github.com/floodlight/loxigen/compare/d593d0135fc000a63fcd4faf840817778f2448d8...9ecc3981a61fb13c40aeb910f1d2c86fb04aa021

floodlight/ivs,floodlight/ivs,floodlight/ivs