HBAC test optional sourcehost option
    
    New version of SSSD begins ignoring sourcehost value of HBAC rules by
    default. In order to match this behaviour the sourcehost option in
    hbactest is optional now, but the value of sourcehost is ignored in all
    rules. Every rule's sourcehost value is set to 'ALL' what turns sourchost
    value comparation off. If srchost option is used, warning is displayed to
    inform the user about changes. Text of plugin help was also updated.
    
    Also the unit tests for hbactest plugin were updated. Every test was
    doubled. The second ones test the plugin without sourcehost option. They
    are supposed to have the same result.
    
    https://fedorahosted.org/freeipa/ticket/2085