Provide a way to display CLI-LDAP relation
    
    Since some LDAP attributes have their cli_name value defined,
    so they can be more user friendly, it can be difficult for user to find
    out which attributes do the parameteres given to CLI really represent.
    This patch provides new command, which will take another IPA command as
    and argument and display attributes which given command takes and what
    LDAP attributes are they mapped to.
    
    https://fedorahosted.org/freeipa/ticket/447