[autotest] RPC logging server

frontend.afe.rpc_handler is not logging RPC logs correctly
due to multi apache processes.
We should have a daemon that receives log records from the
apache processes and writes them in a chronological order.

BUG=chromium:490897
TEST=Run dummy suite on local machine.
DEPLOY=apache

Change-Id: If53667720922d0db248225d17b9e5a31d350f063
Reviewed-on: https://chromium-review.googlesource.com/274827
Reviewed-by: Dan Shi <dshi@chromium.org>
Reviewed-by: Fang Deng <fdeng@chromium.org>
Tested-by: Mungyung Ryu <mkryu@google.com>
Commit-Queue: Mungyung Ryu <mkryu@google.com>
4 files changed