PR 357, ACME order processing, handle errors

When waiting for an ACME order to process to its stages and an error
occured, add information to the result collection at what stage of
processing the order failed.

refs #351

src/md_acmev2_drive.c

@@ -152,11 +152,17 @@ apr_status_t md_acmev2_drive_renew(md_acme_driver_t *ad, md_proto_driver_t *d, m
 
     rv = md_acme_order_monitor_authzs(ad->order, ad->acme, d->md,
                                       ad->authz_monitor_timeout, result, d->p);
-    if (APR_SUCCESS != rv) goto leave;
+    if (APR_SUCCESS != rv) {
+      md_result_set(result, rv, "Error waiting on domain names to be validated");
+      goto leave;
+    }
 
     rv = md_acme_order_await_ready(ad->order, ad->acme, d->md,
                                    ad->authz_monitor_timeout, result, d->p);
-    if (APR_SUCCESS != rv) goto leave;
+    if (APR_SUCCESS != rv) {
+      md_result_set(result, rv, "Error waiting for order to become ready");
+      goto leave;
+    }
 
     if (MD_ACME_ORDER_ST_READY == ad->order->status) {
         rv = md_acme_drive_setup_cred_chain(d, result);
@@ -166,7 +172,10 @@ apr_status_t md_acmev2_drive_renew(md_acme_driver_t *ad, md_proto_driver_t *d, m
 
     rv = md_acme_order_await_valid(ad->order, ad->acme, d->md, 
                                    ad->authz_monitor_timeout, result, d->p);
-    if (APR_SUCCESS != rv) goto leave;
+    if (APR_SUCCESS != rv) {
+      md_result_set(result, rv, "Error waiting for order to become valid.");
+      goto leave;
+    }
 
     if (!ad->order->certificate) {
         md_result_set(result, APR_EINVAL, "Order valid, but certificate url is missing.");