xlat: print _IOC_NONE in symbolic form even if it is equal to 0

xlat: print _IOC_NONE in symbolic form even if it is equal to 0

On some architectures _IOC_NONE equals to 1, on others it is 0.
Change the way how ioctl direction flags are printed so that
_IOC_NONE is printed in symbolic form even if it is equal to 0.

* xlat/ioctl_dirs.in (_IOC_NONE): Move to the head of the list.
* tests/ioctl_inotify.c (main): Update expected output.
* tests/ioctl_loop. (main): Likewise.c
* tests/ioctl_perf.c (main): Likewise.
* tests/ioctl_scsi.c (main): Likewise.