VOL-1460 Updated to use a voltha-protos repo as source for protos

Change-Id: I6e88fb3bb16f91941abaad2f0a810ebc5aa29f36
diff --git a/python/adapters/openolt/openolt_flow_mgr.py b/python/adapters/openolt/openolt_flow_mgr.py
index 19604c5..b05753f 100644
--- a/python/adapters/openolt/openolt_flow_mgr.py
+++ b/python/adapters/openolt/openolt_flow_mgr.py
@@ -20,12 +20,12 @@
 import hashlib
 from simplejson import dumps
 
-from pyvoltha.protos.openflow_13_pb2 import OFPXMC_OPENFLOW_BASIC, \
+from voltha_protos.openflow_13_pb2 import OFPXMC_OPENFLOW_BASIC, \
     ofp_flow_stats, OFPMT_OXM, Flows, FlowGroups, OFPXMT_OFB_IN_PORT, \
     OFPXMT_OFB_VLAN_VID
-from pyvoltha.protos.device_pb2 import Port
+from voltha_protos.device_pb2 import Port
 import pyvoltha.common.openflow.utils as fd
-from pyvoltha.protos import openolt_pb2
+from voltha_protos import openolt_pb2
 from pyvoltha.common.utils.registry import registry
 
 from pyvoltha.common.tech_profile.tech_profile import DEFAULT_TECH_PROFILE_TABLE_ID