update bigcode

* submodules/bigcode 0a84b73...6834d73 (1):
  > Merge into master from pull request #38: Editline Server Module. (https://github.com/floodlight/bigcode/pull/38)
update indigo

* submodules/indigo b6b40ca...ddd8d0e (1):
  > Merge into master from pull request #165: First pass of logging cleanup for OFStateManager (https://github.com/floodlight/indigo/pull/165)
update infra

* submodules/infra 2e51690...09c8460 (2):
  > Merge into master from pull request #28: add update-submodules.sh script (https://github.com/floodlight/infra/pull/28)
  > Merge into master from pull request #30: AIM logging function (https://github.com/floodlight/infra/pull/30)
update loxigen-artifacts

* submodules/loxigen-artifacts 2cc2fe7...af9f136 (2):
  > Artifacts from https://github.com/floodlight/loxigen/compare/17372b7cb7cc6cbf34c1be8fefee2773cbb45636...6ff7f10d9a85b9aa2d384d633a4c3df777012dc1
  > Artifacts from https://github.com/floodlight/loxigen/compare/e9f250b71837a319c258332b32a6512a526fa8c2...17372b7cb7cc6cbf34c1be8fefee2773cbb45636