ENG-6874 implement ByteBufferOutputStream
ENG-6874 fixed license check failures
ENG-6874 http export client emits avro encoded content
ENG-6874 simple ByteBuffer(Input|Output)Stream unit test
ENG-6874 fix license check failure for TestByteBufferStreams
ENG-6874 ByteBufferOutputStreams uses directly allocated byte buffers
Merge pull request #1661 from VoltDB/ENG-6874

ENG-6874 http export client emits avro encoded content