Add annotations to routes and apps (#866)

Adds 'annotations' attribute to Routes and Apps

test/fn-api-tests/config_cases.go

@@ -0,0 +1,29 @@
+package tests
+
+import "reflect"
+
+//  common test cases around config for apps/routes
+
+var updateConfigCases = []struct {
+	name         string
+	intialConfig map[string]string
+	change       map[string]string
+	expected     map[string]string
+}{
+	{"preserve existing config keys with nop", map[string]string{"key": "value1"}, map[string]string{}, map[string]string{"key": "value1"}},
+
+	{"preserve existing config keys with change", map[string]string{"key": "value1"}, map[string]string{"key": "value1"}, map[string]string{"key": "value1"}},
+
+	{"overwrite existing config keys", map[string]string{"key": "value1"}, map[string]string{"key": "value2"}, map[string]string{"key": "value2"}},
+
+	{"delete config key", map[string]string{"key": "value1"}, map[string]string{"key": ""}, map[string]string{}},
+}
+
+//ConfigEquivalent checks if two config objects are semantically equivalent (including nils)
+func ConfigEquivalent(a map[string]string, b map[string]string) bool {
+	if len(a) == 0 && len(b) == 0 {
+		return true
+	}
+	return reflect.DeepEqual(a, b)
+
+}