update bigcode

* submodules/bigcode 1a1385c...71d8762 (1):
  > Merge into master from pull request #36: Latest (https://github.com/floodlight/bigcode/pull/36)
update indigo

* submodules/indigo f789ce5...6f873cb (2):
  > Merge into master from pull request #151: OFConnectionManager: implement bsn_log extension (https://github.com/floodlight/indigo/pull/151)
  > Merge into master from pull request #150: New group API (https://github.com/floodlight/indigo/pull/150)
update loxigen-artifacts

* submodules/loxigen-artifacts adcc8b3...eb1f96d (5):
  > Artifacts from https://github.com/floodlight/loxigen/compare/3805ffaa4eb58eb134017219dbbe12537aa20caf...d4a45c841e8d6dc5cd3ca9ed5e56fcb14cd2a591
  > Artifacts from https://github.com/floodlight/loxigen/compare/7d9242512ccec48103ac0358ebe69cac7ff49a31...3805ffaa4eb58eb134017219dbbe12537aa20caf
  > Artifacts from https://github.com/floodlight/loxigen/compare/eeaa0005c4ee22087bffacc60b7dff420d3fc2cc...7d9242512ccec48103ac0358ebe69cac7ff49a31
  > Artifacts from https://github.com/floodlight/loxigen/compare/cc956a90f13c4088df6fd9f8921f3583ef9e931f...eeaa0005c4ee22087bffacc60b7dff420d3fc2cc
  > Artifacts from https://github.com/floodlight/loxigen/compare/d421394c0f231ec63a4863ecec5abfccf16a6a7b...cc956a90f13c4088df6fd9f8921f3583ef9e931f
update switchlight-common

* submodules/switchlight-common 513b71e...9ea17b4 (1):
  > Merge into master from pull request #59: fix lacp packet drops for junos and cisco ios (https://github.com/floodlight/switchlight-common/pull/59)
Merge into master from pull request #178:
update submodules (https://github.com/floodlight/ivs/pull/178)