[master] 9533146 leave a note on a shard director requirement

[Nils Goroll]

commit 9533146fc4106729262fdd388167b6e0b6662bde
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Mon Mar 5 21:42:43 2018 +0100

    leave a note on a shard director requirement

diff --git a/bin/varnishd/cache/cache_director.h b/bin/varnishd/cache/cache_director.h
index 8d1d380..7db5a4b 100644
--- a/bin/varnishd/cache/cache_director.h
+++ b/bin/varnishd/cache/cache_director.h
@@ -39,6 +39,7 @@
 
 typedef unsigned vdi_healthy_f(const struct director *, const struct busyobj *,
     double *changed);
+/* XXX need a VRT_CTX argument */
 typedef const struct director *vdi_resolve_f(const struct director *,
     struct worker *, struct busyobj *);
 typedef int vdi_gethdrs_f(const struct director *, struct worker *,