fix(angular_1_router): ng-link is generating wrong hrefs

At the moment ng-link is generating html5mode URLs for `href`s.
Instead it should check whether or not html5mode is enabled and create
the `href`s accordingly. The renaming in the `getLink` function is
aligning it to `RouterLink`'s `_updateLink`.

Closes #7423

modules/angular1_router/lib/facades.es5

@@ -316,3 +316,13 @@ Location.prototype.path = function () {
 Location.prototype.go = function (path, query) {
   return $location.url(path + query);
 };
+Location.prototype.prepareExternalUrl = function(url) {
+  if (url.length > 0 && !url.startsWith('/')) {
+    url = '/' + url;
+  }
+  if(!$location.$$html5) {
+    return '#' + url;
+  } else {
+    return '.' + url;
+  }
+};