fifteen: Add openvpn.

This needs to be shipped any way because of the updated
openssl library and the changed set of ciphers that comes
with that.

diff --git a/config/rootfiles/core/fifteen/filelists/openvpn b/config/rootfiles/core/fifteen/filelists/openvpn
new file mode 120000 (symlink)
index 0000000..493f3f7
--- /dev/null
+++ b/config/rootfiles/core/fifteen/filelists/openvpn
@@ -0,0 +1 @@
+../../../common/openvpn
\ No newline at end of file