auth: Make luci-go services trust signatures produced by the token server.

appengine/gaeauth/server/db.go

Index: appengine/gaeauth/server/db.go
diff --git a/appengine/gaeauth/server/db.go b/appengine/gaeauth/server/db.go
index e0e2e8f9ee03f34dc5ad3ff7f117debec13320ed..035984651dcc203af395fa62d6274f5bc54d8e3b 100644
--- a/appengine/gaeauth/server/db.go
+++ b/appengine/gaeauth/server/db.go
@@ -16,6 +16,7 @@ import (
 	"github.com/luci/luci-go/common/logging"
 	"github.com/luci/luci-go/server/auth/authdb"
 	"github.com/luci/luci-go/server/auth/identity"
+	"github.com/luci/luci-go/server/auth/signing"
 	"github.com/luci/luci-go/server/secrets"
 )
 
@@ -98,6 +99,10 @@ func (devServerDB) SharedSecrets(c context.Context) (secrets.Store, error) {
 	return nil, errNotConfigured
 }
 
+func (devServerDB) GetCertificates(c context.Context, id identity.Identity) (*signing.PublicCertificates, error) {
+	return nil, errNotConfigured
+}
+
 func (devServerDB) GetWhitelistForIdentity(c context.Context, ident identity.Identity) (string, error) {
 	return "", nil
 }