autotest: move metrics mock out of graphite lib

This piece of code will remain in use, as the generalized mock class for
metrics calls.

BUG=chromium:738508
TEST=None

Change-Id: I2c690fa52eba6266ea3a8464cb94f0d15b6ef320
Reviewed-on: https://chromium-review.googlesource.com/575578
Commit-Ready: Aviv Keshet <akeshet@chromium.org>
Tested-by: Aviv Keshet <akeshet@chromium.org>
Reviewed-by: Dan Shi <dshi@google.com>
diff --git a/client/common_lib/cros/graphite/stats_es_mock.py b/client/common_lib/metrics_mock_class.py
similarity index 100%
rename from client/common_lib/cros/graphite/stats_es_mock.py
rename to client/common_lib/metrics_mock_class.py
diff --git a/client/common_lib/utils.py b/client/common_lib/utils.py
index 0ce9334..a5da131 100644
--- a/client/common_lib/utils.py
+++ b/client/common_lib/utils.py
@@ -47,7 +47,7 @@
 from autotest_lib.client.common_lib import error
 from autotest_lib.client.common_lib import global_config
 from autotest_lib.client.common_lib import logging_manager
-from autotest_lib.client.common_lib.cros.graphite import stats_es_mock
+from autotest_lib.client.common_lib import metrics_mock_class
 from autotest_lib.client.cros import constants
 
 from autotest_lib.client.common_lib.lsbrelease_utils import *
@@ -2760,6 +2760,6 @@
         time.sleep(sleep_interval)
 
 
-class metrics_mock(stats_es_mock.mock_class_base):
+class metrics_mock(metrics_mock_class.mock_class_base):
     """mock class for metrics in case chromite is not installed."""
     pass