Bug fix on relay slow path, adds debug_flags field. #234
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PR Fixes a bug on the relay slowpath (when the optimistic udx__sendmsg returns UV_EAGAIN). The error code was checked for EAGAIN instead of UV_EAGAIN, and so it wouldn't trigger.
This PR also adds a udx->debug_flags field to make testing slow paths / error paths easier. For this case I added a FORCE_RELAY_SLOW_PATH flag to force taking the slow path. The plan is for more flags to increase test coverage.