Pull in make metadata optional for shibboleth resolver

diff --git a/shibboleth/resolver b/shibboleth/resolver
index dfff542..f66b095 160000 (submodule)
--- a/shibboleth/resolver
+++ b/shibboleth/resolver
@@ -1 +1 @@
-Subproject commit dfff542c1969dd3e59f66c24968dbd153e3e6873
+Subproject commit f66b0951d27f1ff7c3ee9a55727c390947e04527