Fix pty permssion handling in new permission handling code

Fix pty permssion handling in new permission handling code

        * sec_acl.cc (set_posix_access): Always make sure Admins have
        WRITE_DAC and WRITE_OWNER permissions.
        * security.h (create_object_sd_from_attribute): Drop handle parameter
        from prototype.
        * security.cc (create_object_sd_from_attribute): Drop handle parameter.
        Just create the standard POSIXy security descriptor.
        (set_object_attribute): Accommodate dropped paramter in call to
        create_object_sd_from_attribute.
        * fhandler_tty.cc: Ditto, throughout.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>