VOL-3121 - Separated ports from devices.

Similar to flows/groups/meters/logical ports.
Also added ListDevicePorts and GetDevicePort to the adapter API.
Also removed unused `// +build integration` tests.

Change-Id: I586adb9f46a249c9430d4205ef5db2d105dbbe06
diff --git a/go.mod b/go.mod
index 5ceffaa..ee14fab 100644
--- a/go.mod
+++ b/go.mod
@@ -6,8 +6,8 @@
 	github.com/gogo/protobuf v1.3.0
 	github.com/golang/protobuf v1.3.2
 	github.com/google/uuid v1.1.1
-	github.com/opencord/voltha-lib-go/v3 v3.2.0
-	github.com/opencord/voltha-protos/v3 v3.3.9
+	github.com/opencord/voltha-lib-go/v3 v3.2.1
+	github.com/opencord/voltha-protos/v3 v3.4.1
 	github.com/phayes/freeport v0.0.0-20180830031419-95f893ade6f2
 	github.com/stretchr/testify v1.4.0
 	google.golang.org/grpc v1.24.0