comment out unused acl cloudflare

If the acl cloudflare is not used it should be commented out.

root@neliowp:/etc/varnish# service varnish restart
[ ok ] Stopping HTTP accelerator: varnishd.
[FAIL] Starting HTTP accelerator: varnishd failed!

Message from VCC-compiler:
Unused acl cloudflare, defined:
('input' Line 15 Pos 5)
acl cloudflare {
----##########--

Running VCC-compiler failed, exit 1

VCL compilation failed