update loxigen-artifacts
update loxigen-artifacts

* submodules/loxigen-artifacts 48134c9...7c081d1 (2):
  > Artifacts from https://github.com/floodlight/loxigen/compare/bb0235a6ce85c32d5aeee156f1a2fd064456e447...a627b453673e256a0b3ba532ae7e28acbaca5285
  > Merge pull request #2 from shudongz/master

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