tests: enable nock when needed

by default, it makes all requests disappear

src/routes/test/support-test.js

@@ -16,6 +16,7 @@ describe('Support API', function () {
     const { setup, cleanup, serverUrl, owner, mockApiServerOrigin, appstoreToken, user, admin } = common;
 
     before(setup);
+    before(() => { if (!nock.isActive()) nock.activate(); });
     after(cleanup);
 
     const authorizedKeysFile = support._sshInfo().filePath;