update loxigen-artifacts
update loxigen-artifacts

* submodules/loxigen-artifacts 2bdcfd8...515fac2 (1):
  > Artifacts from https://github.com/floodlight/loxigen/compare/764a45f513b0d48abb71813ea89124829221d319...0ab7418dde3e00917b816fce5968c44d768a270d

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