Removed clear text passwords from KRA install log.
    
    The ipa-kra-install tool has been modified to use password files
    instead of clear text passwords when invoking pki tool such that
    the passwords are no longer visible in ipaserver-kra-install.log.
    
    https://fedorahosted.org/freeipa/ticket/5246
    
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>