e817709 ui_tests: change get_http_pkey() function

Authored and Committed by mreznik 6 years ago
    ui_tests: change get_http_pkey() function
    
    change get_http_pkey() function to more generic one in
    order to get pkey for different services
    
    https://pagure.io/freeipa/issue/7441
    
    Reviewed-By: Petr Vobornik <pvoborni@redhat.com>