update indigo

* submodules/indigo dea371a...1a2b943 (2):
  > Merge into master from pull request #155: Add "local" custom log flag to control logging of connection state machine transitions for local connections. (https://github.com/floodlight/indigo/pull/155)
  > 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)
update loxigen-artifacts

* submodules/loxigen-artifacts babd1a1...835e6c4 (2):
  > Artifacts from https://github.com/floodlight/loxigen/compare/2c4d1260433e3e9336d803e76642a5b9034ed190...d521400167a9a8e014afffed95952e3412f85007
  > Artifacts from https://github.com/floodlight/loxigen/compare/d713295cf799f7489dbe5b6defcc07d9fc8a1fba...2c4d1260433e3e9336d803e76642a5b9034ed190
ivs: copy version to sw_desc field

This matches other switches.
Merge into master from pull request #189:
update submodules and put version in sw_desc (https://github.com/floodlight/ivs/pull/189)