HTTP/2 Inbound Flow Control Connection Window Issues

Motivation:
The inbound flow control code was returning too many bytes to the connection window.  This was resulting in GO_AWAYs being generated by peers with the error code indicating a flow control issue.  Bytes were being returned to the connection window before the call to returnProcessedBytes. All of the state representing the connection window was not updated when a local settings event occurred.

Modifications:
The DefaultHttp2InboundFlowController will be updated to correct the above defects.
The unit tests will be updated to reflect the changes.

Result:
Inbound flow control algorithm does not cause peers to send flow control errors for the above mentioned cases.
So the get/set would be just for the stream while the global doesn't have a get/set?  Seems like this is just introducing an inconsistency in the larger convention not to use get/set to solve this problem.  I think using the `Stream` keyword here may be a better option.  Do you agree?