update indigo

* submodules/indigo dea371a...4234342 (1):
  > Merge into master from pull request #152: Convert checksum operations from xor to add/subtract (https://github.com/floodlight/indigo/pull/152)
update infra

* submodules/infra 5e6c157...2e51690 (1):
  > Merge into master from pull request #27: Introduce the DEPENDMODULE_HEADERS variable. (https://github.com/floodlight/infra/pull/27)
Merge into master from pull request #184:
update submodules (https://github.com/floodlight/ivs/pull/184)