cleaned up build warnings

[Aaronontheweb]

Changes

Cleaning up some build warnings.

[Aaronontheweb]

Akka.Streams.Tests.IO.TcpSpec.Tcp_listen_stream_must_bind_and_unbind_correctly
Failed: Timeout 00:00:03 while waiting for a message of type Akka.Streams.TestKit.TestSubscriber+OnError 
Expected: True
Actual:   False

3 failures - means I probably broke what is being tested.

[Aaronontheweb]

Akka.Streams.Tests.IO.TcpSpec.Tcp_listen_stream_must_bind_and_unbind_correctly
Failed: Timeout 00:00:03 while waiting for a message of type Akka.Streams.TestKit.TestSubscriber+OnError 
Expected: True
Actual:   False

3 failures - means I probably broke what is being tested.

Found the issue here - need to return a Task.Failure<T>(ex) whenever these synchronous operations fail. The async keyword did this automatically for us before.