ramfs is now treated as an xattr-supporting filesystem and has the
fs_use_trans directive in the base policy. Thus switch to vfat, which is
still genfs.
Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
This feature is required for proper support of virtiofs with SELinux.
Add a trivial test that verifies that this feature works via a dummy
SELinux module and ramfs mount.
Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>