expose event base from IOThreadPoolExecutor
Summary:
I'm not 100% sure this is the best way to go about this but I don't hate it either.
I'm going to start seeing how it might fit into tserver - my guess is that some sort Cpp2WorkerFactory which also manages those objects would get plugged in as the thread factory
Haven't fleshed out how this would relate to TEventBaseManager
Test Plan: added unit, starting to play with this in Thrift2 server
Reviewed By: davejwatson@fb.com
Subscribers: alandau, bmatheny, trunkagent, fugalh, njormrod
FB internal diff:
D1574660