Fixed bug in methods which hit "apis/{group}/..." url (#741)

* Moved _url.Replace("/apis//", "/api/") down several lines.

Consider the following code:
  var _baseUrl = BaseUri.AbsoluteUri;
  var _url = new System.Uri(new System.Uri(_baseUrl + (_baseUrl.EndsWith("/") ? "" : "/")), "apis/{group}/{version}/namespaces/{namespace}/{plural}").ToString();
  _url = _url.Replace("/apis//", "/api/");
  _url = _url.Replace("{group}", group);
  _url = _url.Replace("{version}", version);
  _url = _url.Replace("{namespace}", namespaceParameter);
  _url = _url.Replace("{plural}", plural);

If group is empty string, we need to replace /apis// with /api.
To do this, we need to replace /apis// after {group}.
Code after the change:

   var _url = new System.Uri(new System.Uri(_baseUrl + (_baseUrl.EndsWith("/") ? "" : "/")), "apis/{group}/{version}/namespaces/{namespace}/{plural}").ToString();
  _url = _url.Replace("{group}", group);
  _url = _url.Replace("{version}", version);
  _url = _url.Replace("{namespace}", namespaceParameter);
  _url = _url.Replace("{plural}", plural);
  _url = _url.Replace("/apis//", "/api/");

* Auto-generated changes

gen/KubernetesGenerator/templates/Kubernetes.cs.template

@@ -61,12 +61,12 @@ namespace k8s
             // Construct URL
             var _baseUrl = BaseUri.AbsoluteUri;
             var _url = new System.Uri(new System.Uri(_baseUrl + (_baseUrl.EndsWith("/") ? "" : "/")), "{{path}}").ToString();
-            _url = _url.Replace("/apis//", "/api/");
             {{#operation.parameters}}
             {{#IfKindIs . "path"}}
             _url = _url.Replace("{{AddCurly name}}", {{GetDotNetName name}});
             {{/IfKindIs . "path"}}
             {{/operation.parameters}}
+            _url = _url.Replace("/apis//", "/api/");
             List<string> _queryParameters = new List<string>();
             {{#operation.parameters}}
             {{#IfKindIs . "query"}}