update bigcode

* submodules/bigcode 0d54b67...437ac9f (2):
  > Merge into master from pull request #15: ip checksum fix for odd data lengths (https://github.com/floodlight/bigcode/pull/15)
  > Merge into master from pull request #14: ucli memory fixes (https://github.com/floodlight/bigcode/pull/14)
update indigo

* submodules/indigo b86b630...4ce611c (1):
  > Merge into master from pull request #95: implement bsn_flow_checksum extension (https://github.com/floodlight/indigo/pull/95)
update infra

* submodules/infra 6898254...740f39b (2):
  > Merge into master from pull request #18: AIM: fix aim_pvs_buffer_iterate after reset (https://github.com/floodlight/infra/pull/18)
  > Merge into master from pull request #17: Support string format and duplication using AIM datatype formatting. (https://github.com/floodlight/infra/pull/17)
update loxigen-artifacts

* submodules/loxigen-artifacts 515fac2...14cfbaf (3):
  > Artifacts from https://github.com/floodlight/loxigen/compare/21edcd566433c1624b469aa10671b453bc9aa202...28facb20a27a5118ece1de1463eee9c54e68e19c
  > Artifacts from https://github.com/floodlight/loxigen/compare/fd2f04304448cf0505ea23aa326e83026993712e...21edcd566433c1624b469aa10671b453bc9aa202
  > Artifacts from https://github.com/floodlight/loxigen/compare/0ab7418dde3e00917b816fce5968c44d768a270d...fd2f04304448cf0505ea23aa326e83026993712e
Merge into master from pull request #122:
update submodules (https://github.com/floodlight/ivs/pull/122)