remove unused function in keymutex_test.go file

pkg/util/keymutex/keymutex_test.go

@@ -91,21 +91,3 @@ func verifyCallbackDoesntHappens(t *testing.T, callbackCh <-chan interface{}) bo
 		return true
 	}
 }
-
-func verifyNoError(t *testing.T, err error, name string) {
-	if err != nil {
-		t.Fatalf("Unexpected response on %q. Expected: <no error> Actual: <%v>", name, err)
-	}
-}
-
-func verifyError(t *testing.T, err error, name string) {
-	if err == nil {
-		t.Fatalf("Unexpected response on %q. Expected: <error> Actual: <no error>", name)
-	}
-}
-
-func verifyMsg(t *testing.T, expected, actual string) {
-	if actual != expected {
-		t.Fatalf("Unexpected testMsg value. Expected: <%v> Actual: <%v>", expected, actual)
-	}
-}