update indigo

* submodules/indigo 66728a7...fb7ca89 (5):
  > Merge into master from pull request #88: SocketManager: make maximum number of timers configurable (https://github.com/floodlight/indigo/pull/88)
  > Merge into master from pull request #87: OFStateManager: log switch DPID (https://github.com/floodlight/indigo/pull/87)
  > Merge into master from pull request #86: Standardize memory allocations (https://github.com/floodlight/indigo/pull/86)
  > Merge into master from pull request #84: replace INDIGO_{MALLOC,FREE} with aim_{malloc,free} (https://github.com/floodlight/indigo/pull/84)
  > Merge into master from pull request #83: OFStateManager: do not send error message when deleting a nonexistent gentable entry (https://github.com/floodlight/indigo/pull/83)
ivs: increase maximum number of timers

16 constant + 64 ports * 5 per port, rounded up.
Merge into master from pull request #110:
increase maximum number of timers (https://github.com/floodlight/ivs/pull/110)