Chameleon: Rename display_xmlrpc_server to multimedia_xmlrpc_server

It is the first of the CL chain which unifies the display, audio, and video
client library from a server-side tests.

BUG=chromium:407004
TEST=Ran the Chameleon test display_Resolution.mirrored and it passed.

Change-Id: I47ce9d78a4dbe16d62fb3361c91e71e8143924f5
Reviewed-on: https://chromium-review.googlesource.com/214422
Reviewed-by: Ting-Yuan Cheng <tingyuan@chromium.org>
Reviewed-by: Mussa Kiroga <mussa@chromium.org>
Reviewed-by: Wai-Hong Tam <waihong@chromium.org>
Tested-by: Wai-Hong Tam <waihong@chromium.org>
Commit-Queue: Cheng-Yi Chiang <cychiang@chromium.org>
8 files changed