[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>
diff --git a/global_config.ini b/global_config.ini
index 637ef3b..f0702eb 100644
--- a/global_config.ini
+++ b/global_config.ini
@@ -104,6 +104,8 @@
 # Number of old logs to keep around
 rpc_num_old_logs: 5
 rpc_max_log_size_mb: 20
+# Transfer RPC logs to a RPC logging server
+rpc_logserver: False
 # Minimum amount of disk space required for AutoTest in GB
 gb_diskspace_required: 1.0
 # Minmum number of i-nodes for stateful, in 1000 i-node units.