Changing cert-find to go through the proxy instead of using the port 8080
    
    The cert-find command now uses the proxy to reach Dogtag, instead of using
    the port 8080. In order to accomplish that, it's necessary to change the
    proxy configuration including the URL called.
    
    https://pagure.io/freeipa/issue/6966
    
    Reviewed-By: Fraser Tweedale <ftweedal@redhat.com>