VOL-931 Adding statistics collection trigger

Change-Id: Ic3cf2876209a839584d8cd2658ab0cd7124b3bc8
diff --git a/voltha/adapters/openolt/protos/openolt.proto b/voltha/adapters/openolt/protos/openolt.proto
index 8187faf..45ca664 100644
--- a/voltha/adapters/openolt/protos/openolt.proto
+++ b/voltha/adapters/openolt/protos/openolt.proto
@@ -123,6 +123,13 @@
         };
     }
 
+    rpc CollectStatistics(Empty) returns (Empty) {
+        option (google.api.http) = {
+            post: "/v1/CollectStatistics"
+            body: "*"
+        };
+    }
+
     rpc EnableIndication(Empty) returns (stream Indication) {}
 }