Chameleon: Improve the naming of classes to access DUT display/audio

This change does the following name changes:

Client side:
  AudioUtility -> AudioFacadeNative, only accept native types, for RPC
  DisplayUtility -> DisplayFacadeNative, only accept native types, for RPC

Server side:
  AudioClient -> AudioFacadeRemoteAdapter, an adapter to AudioFacadeNative
  DisplayClient -> DisplayFacadeRemoteAdapter, an adapter to DisplayFacadeNative
  MultimediaClientFactory -> RemoteFacadeFactory, to create facade in remote

Also fix some pylint errors.

BUG=chromium:405143
TEST=Ran the chameleon_hdmi suite on Falco.

Change-Id: I9c2517f68236bd033ffb7df3c21629b42956f790
Reviewed-on: https://chromium-review.googlesource.com/226140
Commit-Queue: Wai-Hong Tam <waihong@chromium.org>
Tested-by: Wai-Hong Tam <waihong@chromium.org>
Reviewed-by: Wai-Hong Tam <waihong@chromium.org>
15 files changed