Add workaround for resolver/compat integration

resolver/compat.go

@@ -0,0 +1,12 @@
+package resolver
+
+import "net"
+
+// This is a workaround for enabling the resolver to work with the compat
+// module without importing it. Long-term, the network module should not import
+// the resolver package, as this breaks the SPN hub.
+var (
+	CompatDNSCheckInternalDomainScope string
+	CompatSelfCheckIsFailing          func() bool
+	CompatSubmitDNSCheckDomain        func(subdomain string) (respondWith net.IP)
+)