VOL-3419: Replicate voltha flows in openolt agent
- Use the flow_id, symmetric_flow_id, replication_flag and pbit_to_gemport_map
  coming in Flow proto messge to replicate the flow as needed
- Use the CreateQueues and RemoveQueues messages to setup and remove gem_ports
- Use latest gRPC version 1.31.1 which allows fine tuning of gRPC threadpools
  which allows for greating performance.
- Performance numbers when tested with openolt-scale-tester has been better with
  using latest gRPC and threadpool tuning when compared to earlier. It is to be
  noted that the performance is better even with openolt-agent replicating the flow
  now.
- Scale tests with 512 subscribers have been successfull with BAL3.4.7.5 version
- Use openolt proto version 4.0.0
- Use openolt-test (for unit test) image version 2.0.1 (which bundles latest gRPC version 1.31.1)
- These changes are NOT backward compatible and openolt-agent will have a major
  version bump to 3.0.0

Change-Id: I715c804bdf342e60d08cab6c59e1c21b8c5ac1f4
diff --git a/agent/src/stats_collection.cc b/agent/src/stats_collection.cc
index 4979366..5b7063a 100644
--- a/agent/src/stats_collection.cc
+++ b/agent/src/stats_collection.cc
@@ -245,7 +245,7 @@
         openolt::PortStatistics* port_stats =
             collectPortStatistics(intf_ref);
 
-        openolt::Indication ind;
+        ::openolt::Indication ind;
         ind.set_allocated_port_stats(port_stats);
         oltIndQ.push(ind);
     }
@@ -258,7 +258,7 @@
         openolt::PortStatistics* port_stats =
             collectPortStatistics(intf_ref);
 
-        openolt::Indication ind;
+        ::openolt::Indication ind;
         ind.set_allocated_port_stats(port_stats);
         oltIndQ.push(ind);
     }