Convert ipa-httpd-pwdreader into Python script
    
    and use paths from ipaplatform.
    
    Fixes: https://pagure.io/freeipa/issue/8401
    Signed-off-by: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
    Reviewed-By: Francois Cami <fcami@redhat.com>