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/adapters/adapterif/adapter_proxy_if.go b/pkg/adapters/adapterif/adapter_proxy_if.go
index 8197170..de5cfc0 100644
--- a/pkg/adapters/adapterif/adapter_proxy_if.go
+++ b/pkg/adapters/adapterif/adapter_proxy_if.go
@@ -20,7 +20,7 @@
 	"context"
 
 	"github.com/golang/protobuf/proto"
-	ic "github.com/opencord/voltha-protos/v2/go/inter_container"
+	ic "github.com/opencord/voltha-protos/v3/go/inter_container"
 )
 
 // AdapterProxy interface for AdapterProxy implementation.