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/vendor/modules.txt b/vendor/modules.txt
index a768d49..82c3cb8 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -97,13 +97,13 @@
 github.com/modern-go/concurrent
 # github.com/modern-go/reflect2 v1.0.1
 github.com/modern-go/reflect2
-# github.com/opencord/voltha-protos/v2 v2.1.0
-github.com/opencord/voltha-protos/v2/go/inter_container
-github.com/opencord/voltha-protos/v2/go/openflow_13
-github.com/opencord/voltha-protos/v2/go/voltha
-github.com/opencord/voltha-protos/v2/go/tech_profile
-github.com/opencord/voltha-protos/v2/go/common
-github.com/opencord/voltha-protos/v2/go/omci
+# github.com/opencord/voltha-protos/v3 v3.0.0
+github.com/opencord/voltha-protos/v3/go/inter_container
+github.com/opencord/voltha-protos/v3/go/openflow_13
+github.com/opencord/voltha-protos/v3/go/voltha
+github.com/opencord/voltha-protos/v3/go/tech_profile
+github.com/opencord/voltha-protos/v3/go/common
+github.com/opencord/voltha-protos/v3/go/omci
 # github.com/phayes/freeport v0.0.0-20180830031419-95f893ade6f2
 github.com/phayes/freeport
 # github.com/pierrec/lz4 v2.3.0+incompatible