Update comment in common.go to clarify that cacert is optionsl

Author: marbindrakon

internal/openstack/common.go

@@ -602,7 +602,7 @@ func (ed *EndpointDetail) CreateRoute(
 		certSecret := &k8s_corev1.Secret{}
 
 		// if a custom cert secret was provided, check if it exist
-		// and has the required cert, key and cacert
+		// and has the required cert and key (cacert optional)
 		// Right now there is no check if certificate is valid for
 		// the hostname of the route. If the referenced secret is
 		// there and has the required files it is just being used.