generic: add test of file mode when setfacl fails

generic: add test of file mode when setfacl fails

Check that the group permission bits of a file are not altered when
setfacl fails. At the time of this patch the test fails for at least
ext2, ext4, jfs and btrfs.

The failure in setfacl is induced by filling the device and setting
as many user attributes to the file as possible. For xfs this is not
enough, and the test will not run.

[eguan replaced setfattr with $SETFATTR_PROG and added enospc group]

Signed-off-by: Ernesto A. Fernández <ernesto.mnd.fernandez@gmail.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>