Allow unicode in service paths

- according to discussion in #1013 all unicode characters are
valid label values - this commit allows the original path to be
retained.

Signed-off-by: Alex Ellis (VMware) <alexellis2@gmail.com>

gateway/handlers/notifiers_test.go

@@ -0,0 +1,23 @@
+package handlers
+
+import "testing"
+
+func Test_urlToLabel_normalizeTrailing(t *testing.T) {
+	have := "/system/functions/"
+	want := "/system/functions"
+	got := urlToLabel(have)
+
+	if got != want {
+		t.Errorf("want %s, got %s", want, got)
+	}
+}
+
+func Test_urlToLabel_retainRoot(t *testing.T) {
+	have := "/"
+	want := have
+	got := urlToLabel(have)
+
+	if got != want {
+		t.Errorf("want %s, got %s", want, got)
+	}
+}