update bigcode

* submodules/bigcode 9502bad...53b1a99 (3):
  > Merge into master from pull request #20: biglist: don't zero new elements (https://github.com/floodlight/bigcode/pull/20)
  > Merge into master from pull request #19: timer_wheel: add missing ucli handlers array (https://github.com/floodlight/bigcode/pull/19)
  > Merge into master from pull request #18: handle indianess in ip checksum calc with odd lengths (https://github.com/floodlight/bigcode/pull/18)
update infra

* submodules/infra 6898254...3ffc4c1 (7):
  > Merge into master from pull request #20: AIM: add early check for log level (https://github.com/floodlight/infra/pull/20)
  > 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.
  > The LIBRARY_TARGETS_LAST list must be moved to the end every time a new library is added.
  > Support the LIBRARY_LAST attribute. - Libraries that indicate the LAST attribute will always be kept at the end of the global LIBRARY_TARGETS list.   The ordering between LAST libraries is arbitrary.
  > 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 9138196...56f7807 (5):
  > Artifacts from https://github.com/floodlight/loxigen/compare/ffa04cc24b045e010c3020e2cbb8ce31cbec8895...1c5679af766cc2785f088707e83dbd5b6ac0a698
  > Artifacts from https://github.com/floodlight/loxigen/compare/27a64222e92b38e23b253657c702986c0604145a...ffa04cc24b045e010c3020e2cbb8ce31cbec8895
  > Artifacts from https://github.com/floodlight/loxigen/compare/24b6c19d413555f2aaf9129c552f5128964fefe8...27a64222e92b38e23b253657c702986c0604145a
  > Artifacts from https://github.com/floodlight/loxigen/compare/767b11df765065ac1f815ceeb27690747b67fb09...24b6c19d413555f2aaf9129c552f5128964fefe8
  > Artifacts from https://github.com/floodlight/loxigen/compare/1bc22f26bd88dae76dc749137998c16864718d5d...767b11df765065ac1f815ceeb27690747b67fb09
OFStateManager: update to new of_object_t layout
Merge into master from pull request #117:
update submodules (https://github.com/floodlight/indigo/pull/117)