VOL-1483 Update voltha-cli to use pyvoltha

Modifications done to use pyvoltha and voltha_protos libraries.

Change-Id: I2f6038fa9fce47459c68cc6e06ddc6bec3150cd6
diff --git a/python/cli/device.py b/python/cli/device.py
index 38ea835..484185f 100644
--- a/python/cli/device.py
+++ b/python/cli/device.py
@@ -24,10 +24,8 @@
 
 from table import print_pb_as_table, print_pb_list_as_table
 from utils import print_flows, pb2dict, enum2name
-from python.protos import third_party
 
-_ = third_party
-from python.protos import voltha_pb2, common_pb2
+from voltha_protos import voltha_pb2, common_pb2
 import sys
 import json
 from google.protobuf.json_format import MessageToDict