Fix 404 when deleting indexed cloud

When 2 clouds have the same name the second one has a different url with
`cloudByIndex` as additional intermediate. When deleting the cloud it
redirected to `..` i.e. `/cloud/cloudByIndex/` which produces a 404.
Deleting a cloud now redirects to `/cloud`

Author: mawinter69

core/src/main/java/hudson/slaves/Cloud.java

@@ -57,8 +57,8 @@
 import org.kohsuke.accmod.Restricted;
 import org.kohsuke.accmod.restrictions.DoNotUse;
 import org.kohsuke.stapler.DataBoundConstructor;
-import org.kohsuke.stapler.HttpRedirect;
 import org.kohsuke.stapler.HttpResponse;
+import org.kohsuke.stapler.HttpResponses;
 import org.kohsuke.stapler.StaplerRequest;
 import org.kohsuke.stapler.StaplerRequest2;
 import org.kohsuke.stapler.StaplerResponse2;
@@ -313,7 +313,7 @@ public String getIconAltText() {
     public HttpResponse doDoDelete() throws IOException {
         checkPermission(Jenkins.ADMINISTER);
         Jenkins.get().clouds.remove(this);
-        return new HttpRedirect("..");
+        return HttpResponses.redirectViaContextPath("cloud");
     }
 
     /**