Previously lldb-mi contains a stub for that but it didn't work and all CommanInterpreter's events were ignored.
This commit adds a handling of CommandInterpreter's events in lldb-mi.
- Fix CMICmnLLDBDebugger::InitSBListener
- Add SBCommandInterpreter::EventIsCommandInterpreterEvent
- Exit on lldb::SBCommandInterpreter::eBroadcastBitQuitCommandReceived
All tests pass on OS X.
In further we can remove "quit" hack in lldb-mi.