[VOL-5603]:Metrics fix,update protos in voltctl

Signed-off-by: balaji.nagarajan <balaji.nagarajan@radisys.com>
Change-Id: I92702118bef90623ef7c68c646c86634e60d889d
diff --git a/vendor/github.com/jcmturner/gokrb5/v8/client/session.go b/vendor/github.com/jcmturner/gokrb5/v8/client/session.go
index f7654d0..7e1e65c 100644
--- a/vendor/github.com/jcmturner/gokrb5/v8/client/session.go
+++ b/vendor/github.com/jcmturner/gokrb5/v8/client/session.go
@@ -41,7 +41,9 @@
 			// Cancel the one in the cache and add this one.
 			i.mux.Lock()
 			defer i.mux.Unlock()
-			i.cancel <- true
+			if i.cancel != nil {
+				i.cancel <- true
+			}
 			s.Entries[sess.realm] = sess
 			return
 		}