Merge changes from topic "ctsmediav2-20200414" into rvc-dev

* changes:
  MediaCodec Test: Add Media Codec NDK Unit test
  CTS Tests for MediaCodec native
  CodecTest: Add SDK encoder surface tests
  MediaCodec Test: Add Media Codec SDK Unit test
  MediaCodec CTS: Code refactoring
  CodecEncoderTest: add tests for force keyframe, dynamic bitrate change