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/techprofile/config.go b/pkg/techprofile/config.go
index b1a8ac5..2df7147 100644
--- a/pkg/techprofile/config.go
+++ b/pkg/techprofile/config.go
@@ -16,7 +16,7 @@
 package techprofile
 
 import (
-	"github.com/opencord/voltha-lib-go/v2/pkg/db"
+	"github.com/opencord/voltha-lib-go/v3/pkg/db"
 )
 
 // tech profile default constants