[Metric] Refactor Frontend-exporter (#413)

* Fix dict unpacking lint error

* Format Code

* Update yapf

* Update yapf and reformat code

* Check yapf version in shell script

* Change `echo` to `cat`

* Add python version check; almost ready

* Format code with python version 2.7.12

* Separate frontend-exporter as depolyment outside query-frontend

1. Move it to deployment
2. Because it's no longer in the same pod as query-frontend, we
now need to directly call against query-frontend service.
3. Update fronte_end_exporter image to accept ports.
4. Update docker metric for corresponding change

* Remove k8s part

* Format code

* Address Comment

clipper_admin/clipper_admin/docker/docker_metric_utils.py

@@ -4,6 +4,7 @@
 import os
 from ..exceptions import ClipperException
 from ..version import __version__
+from ..container_manager import CLIPPER_INTERNAL_QUERY_PORT
 
 PROM_VERSION = "v2.1.0"
 
@@ -43,7 +44,8 @@ def run_query_frontend_metric_image(name, docker_client, query_name,
     :return: None
     """
 
-    query_frontend_metric_cmd = "--query_frontend_name {}".format(query_name)
+    query_frontend_metric_cmd = "--query_frontend_name {}:{}".format(
+        query_name, CLIPPER_INTERNAL_QUERY_PORT)
     query_frontend_metric_labels = common_labels.copy()
 
     docker_client.containers.run(

monitoring/front_end_exporter.py

@@ -18,7 +18,7 @@
 
 query_frontend_id = args.query_frontend_name
 
-ADDRESS = 'http://{}:1337/metrics'.format(query_frontend_id)
+ADDRESS = 'http://{}/metrics'.format(query_frontend_id)
 
 
 def load_metric():