tests: enable nock when needed

by default, it makes all requests disappear

src/test/common.js

@@ -212,6 +212,7 @@ function createTree(root, obj) {
 }
 
 async function databaseSetup() {
+    if (nock.isActive()) nock.restore();
     nock.cleanAll();
 
     await database.initialize();
@@ -221,6 +222,7 @@ async function databaseSetup() {
 }
 
 async function domainSetup() {
+    if (nock.isActive()) nock.restore();
     nock.cleanAll();
 
     await databaseSetup();
@@ -242,6 +244,7 @@ async function setup() {
 }
 
 async function cleanup() {
+    if (nock.isActive()) nock.restore();
     nock.cleanAll();
     mailer._mailQueue = [];