update indigo

* submodules/indigo bbd61ac...fda9a1e (1):
  > Merge into master from pull request #70: OFConnectionManager: initialize generation ID to 0 (https://github.com/floodlight/indigo/pull/70)
Merge into master from pull request #78:
update indigo (https://github.com/floodlight/ivs/pull/78)