Norman Maurer 3080d14f25 Fix buffer leaks in HTTP2 codec
Motivation:
Our ci showed some buffer leaks in the http2 codec. This commit fixes all of these.

Modifications:
* Correctly release buffers in DefaultHttp2FrameWriter
* Fix buffer leaks in tests

Result:
Tests pass without leaks
2014-05-07 06:53:02 +02:00
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