update bigcode

* submodules/bigcode 43a58a9...53b1a99 (1):
  > Merge into master from pull request #20: biglist: don't zero new elements (https://github.com/floodlight/bigcode/pull/20)
update infra

* submodules/infra c5bd334...9bccd30 (2):
  > Merge into master from pull request #19: Allow customization of the aim_main() function name. (https://github.com/floodlight/infra/pull/19)
  > Support optional AIM library constructor/destructor. - Allows module initialization in shared library builds. - Support for this feature is GCC-specific.
update loxigen-artifacts

* submodules/loxigen-artifacts 9138196...03c51fd (1):
  > Artifacts from https://github.com/floodlight/loxigen/compare/1bc22f26bd88dae76dc749137998c16864718d5d...767b11df765065ac1f815ceeb27690747b67fb09
update switchlight-common

* submodules/switchlight-common cc05e26...2318ad4 (1):
  > Merge into master from pull request #37: change icmpa system counters to use debug_counter infra (https://github.com/floodlight/switchlight-common/pull/37)
Merge into master from pull request #140:
update submodules (https://github.com/floodlight/ivs/pull/140)