VOL-1643 Update voltha-lib-go to use voltha-protos v3.0.0

and bump up the version to 3.0.0. voltha-protos is modified to be
compatible with the java language proto compilation. It's a major
change and a major version change has been made.

Change-Id: Ifb93430567ddf96aaa0fbf6e5853aad9e1070f6f
diff --git a/pkg/flows/flow_utils.go b/pkg/flows/flow_utils.go
index d3cf74d..b9981e6 100644
--- a/pkg/flows/flow_utils.go
+++ b/pkg/flows/flow_utils.go
@@ -21,8 +21,8 @@
 	"fmt"
 	"github.com/cevaris/ordered_map"
 	"github.com/gogo/protobuf/proto"
-	"github.com/opencord/voltha-lib-go/v2/pkg/log"
-	ofp "github.com/opencord/voltha-protos/v2/go/openflow_13"
+	"github.com/opencord/voltha-lib-go/v3/pkg/log"
+	ofp "github.com/opencord/voltha-protos/v3/go/openflow_13"
 	"math/big"
 	"strings"
 )