vp9 svc: Refactor svc datarate test for better sharding.
vp9 svc: Refactor svc datarate test for better sharding.

Wrap denoiser tests under config flags.

Change-Id: I6175c3c9d8b5b079ad35a55553383145db58a10f

webmproject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,ShiftMediaProject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,webmproject/libvpx