de4627852f
Motivation: `Http2StreamChannelBootstrap#open0` invokes `Http2MultiplexHandler#newOutboundStream()` which may throw an `IllegalStateException`. In this case, it will never complete the passed promise. Modifications: - `try-catch` all invocations of `newOutboundStream()` and fail promise in case of any exception; Result: New H2 stream promise always completes.