s3: smbd: VFS: Add custom initialization for vfs_widelinks.

s3: smbd: VFS: Add custom initialization for vfs_widelinks.

As the widelinks logic is now moving into a
vfs_widelinks module, we need to custom load
it after the default module is initialized.
That way no changes to smb.conf files are
needed.

We may revisit this for Samba 5.0 and force
people to change their smb.conf files and
explicitly load this as a vfs module if they
want the insecure widelinks behavior.

Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>