update indigo
adapt to synchronous Indigo APIs

Changes are mechanical and small. Improved error handling in a couple of
functions too.
Forwarding utest: update to new APIs
Forwarding utest: fix use-after-free bug
PortManager utest: update to new APIs
Merge into master from pull request #2:
update LRI to new synchronous Indigo APIs (https://github.com/floodlight/lri/pull/2)