Renames DbClient to CommonDbClient to avoid confusion

POL comunicates with two different databases, a relational
one, that stores records for alarms, scaling groups and more,
and a nonrelational one, that is common to all OSM modules,
which we call CommonDB, that currently corrsponds to a MongoDB
instance and stores nsds, vnfds, etc.
The name db_client and DbClient used in the file and
class that comunicates with CommonDB may be open to confussion,
so it has been renamed as common_db_client and CommonDbClient.

Signed-off-by: Benjamin Diaz <bdiaz@whitestack.com>
Change-Id: I8209cbc23b5ab129221d1c928703929e4f405a4c
diff --git a/osm_policy_module/common/db_client.py b/osm_policy_module/common/common_db_client.py
similarity index 98%
rename from osm_policy_module/common/db_client.py
rename to osm_policy_module/common/common_db_client.py
index 1eed0f3..83bb46c 100644
--- a/osm_policy_module/common/db_client.py
+++ b/osm_policy_module/common/common_db_client.py
@@ -26,7 +26,7 @@
 from osm_policy_module.core.config import Config
 
 
-class DbClient:
+class CommonDbClient:
     def __init__(self):
         cfg = Config.instance()
         self.common_db = dbmongo.DbMongo()
diff --git a/osm_policy_module/core/agent.py b/osm_policy_module/core/agent.py
index d637374..1e81141 100644
--- a/osm_policy_module/core/agent.py
+++ b/osm_policy_module/core/agent.py
@@ -30,7 +30,7 @@
 import yaml
 from aiokafka import AIOKafkaConsumer
 
-from osm_policy_module.common.db_client import DbClient
+from osm_policy_module.common.common_db_client import CommonDbClient
 from osm_policy_module.common.lcm_client import LcmClient
 from osm_policy_module.common.mon_client import MonClient
 from osm_policy_module.core import database
@@ -48,7 +48,7 @@
         if not loop:
             loop = asyncio.get_event_loop()
         self.loop = loop
-        self.db_client = DbClient()
+        self.db_client = CommonDbClient()
         self.mon_client = MonClient(loop=self.loop)
         self.lcm_client = LcmClient(loop=self.loop)
         self.kafka_server = '{}:{}'.format(cfg.OSMPOL_MESSAGE_HOST,
diff --git a/osm_policy_module/tests/integration/test_policy_agent.py b/osm_policy_module/tests/integration/test_policy_agent.py
index a2794eb..11bc969 100644
--- a/osm_policy_module/tests/integration/test_policy_agent.py
+++ b/osm_policy_module/tests/integration/test_policy_agent.py
@@ -32,7 +32,7 @@
 from osm_common.dbmongo import DbMongo
 from peewee import SqliteDatabase
 
-from osm_policy_module.common.db_client import DbClient
+from osm_policy_module.common.common_db_client import CommonDbClient
 from osm_policy_module.common.mon_client import MonClient
 from osm_policy_module.core import database
 from osm_policy_module.core.agent import PolicyModuleAgent
@@ -423,9 +423,9 @@
     @patch.object(DbMongo, 'db_connect', Mock())
     @patch.object(KafkaProducer, '__init__')
     @patch.object(MonClient, 'create_alarm')
-    @patch.object(DbClient, 'get_vnfd')
-    @patch.object(DbClient, 'get_nsr')
-    @patch.object(DbClient, 'get_vnfr')
+    @patch.object(CommonDbClient, 'get_vnfd')
+    @patch.object(CommonDbClient, 'get_nsr')
+    @patch.object(CommonDbClient, 'get_vnfr')
     def test_configure_scaling_groups(self, get_vnfr, get_nsr, get_vnfd, create_alarm, kafka_producer_init):
         def _test_configure_scaling_groups_get_vnfr(*args, **kwargs):
             if '1' in args[1]: