BNC#872793 Use links instead of data-href in node dashboard

https://bugzilla.novell.com/show_bug.cgi?id=872793

Instead of using data-href loading of new content, use regular links for
the nodes dashboard.

This is a workaround for cases when the ajax-based loading results in
500 error and there is no indication of what went wrong. With links, an
error page will be shown instead.