autotest: move or eliminate a bunch of autotest_stats stats

BUG=chromium:667171
TEST=unittests; guado_moblab tryjob + test run

Change-Id: I815d2d748a2daa3bc869ead5d09f722245b7317b
Reviewed-on: https://chromium-review.googlesource.com/413103
Reviewed-by: Aviv Keshet <akeshet@chromium.org>
Commit-Queue: Aviv Keshet <akeshet@chromium.org>
Tested-by: Aviv Keshet <akeshet@chromium.org>
diff --git a/frontend/afe/rpc_utils.py b/frontend/afe/rpc_utils.py
index 95206bb..3ff81cd 100644
--- a/frontend/afe/rpc_utils.py
+++ b/frontend/afe/rpc_utils.py
@@ -19,6 +19,8 @@
 from autotest_lib.client.common_lib import control_data, error
 from autotest_lib.client.common_lib import global_config, priorities
 from autotest_lib.client.common_lib import time_utils
+# TODO(akeshet): Replace with monarch once we know how to instrument rpc server
+# with ts_mon.
 from autotest_lib.client.common_lib.cros.graphite import autotest_stats
 from autotest_lib.server import utils as server_utils
 from autotest_lib.server.cros import provision