update infra

* submodules/infra 3913825...5e6c157 (1):
  > Merge into master from pull request #26: AIM: squelch unused variable warnings from ASSERT (https://github.com/floodlight/infra/pull/26)
update loxigen-artifacts

* submodules/loxigen-artifacts 8e16135...528d95f (1):
  > Artifacts from https://github.com/floodlight/loxigen/compare/4087b17e3477cbc9d010d8f78f80cbff0b083882...58a783110072c8a8cbc0d580d8f8dffcb71e8bfa