fix(router): support outlets in non-absolute positions

modules/@angular/router/test/create_url_tree.spec.ts

@@ -72,6 +72,12 @@ describe('createUrlTree', () => {
     expect(serializer.serialize(t)).toEqual('/a/(b//right:d/11/e)');
   });
 
+  it('should throw when outlets is not the last command', () => {
+    const p = serializer.parse('/a');
+    expect(() => createRoot(p, ['a', {outlets: {right: ['c']}}, 'c']))
+        .toThrowError('{outlets:{}} has to be the last command');
+  });
+
   it('should support updating using a string', () => {
     const p = serializer.parse('/a(right:b)');
     const t = createRoot(p, [{outlets: {right: 'c/11/d'}}]);
@@ -188,6 +194,12 @@ describe('createUrlTree', () => {
       expect(() => create(p.root.children[PRIMARY_OUTLET], 0, p, ['../../']))
           .toThrowError('Invalid number of \'../\'');
     });
+
+    it('should support updating secondary segments', () => {
+      const p = serializer.parse('/a/b');
+      const t = create(p.root.children[PRIMARY_OUTLET], 1, p, [{outlets: {right: ['c']}}]);
+      expect(serializer.serialize(t)).toEqual('/a/b/(right:c)');
+    });
   });
 
   it('should set query params', () => {
@@ -209,7 +221,6 @@ describe('createUrlTree', () => {
   });
 });
 
-
 function createRoot(tree: UrlTree, commands: any[], queryParams?: Params, fragment?: string) {
   const s = new ActivatedRouteSnapshot(
       [], <any>{}, <any>{}, '', <any>{}, PRIMARY_OUTLET, 'someComponent', null, tree.root, -1,