VOL-3934 - TLS connection support

This is a bit of a breaking change as the current voltctl config
file defines verify as a string when it should have been a bool
from the start.

depends on merge of https://gerrit.opencord.org/c/voltha-lib-go/+/23594

Change-Id: Idb1f90a6bc827a599f2290bd276604997aab44e8
diff --git a/go.mod b/go.mod
index faf0bb0..594bef5 100644
--- a/go.mod
+++ b/go.mod
@@ -9,9 +9,10 @@
 	github.com/imdario/mergo v0.3.7 // indirect
 	github.com/jessevdk/go-flags v1.4.0
 	github.com/jhump/protoreflect v1.5.0
-	github.com/opencord/voltha-lib-go/v4 v4.0.6
-	github.com/opencord/voltha-protos/v4 v4.0.11
+	github.com/opencord/voltha-lib-go/v4 v4.2.1
+	github.com/opencord/voltha-protos/v4 v4.0.16
 	github.com/stretchr/testify v1.4.0
+	go.etcd.io/etcd v0.0.0-20190930204107-236ac2a90522
 	golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45 // indirect
 	golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 // indirect
 	google.golang.org/appengine v1.6.1 // indirect