Feat/371 view only user implementation using user_permissions (#381)

* https://github.com/jambonz/jambonz-api-server/issues/371

Implemented view_only permission feature

* calling prepare-permissions in create-test-db.js

* check if there is only 1 permission and if it is VIEW_ONLY then consider user as read-only user

* setting is_view_only flag for view user by userid

test/users.js

@@ -20,7 +20,13 @@ test('add an admin user', (t) => {
     t.end();
   });
 });
-
+test('prepare permissions', (t) => {
+  exec(`mysql -h 127.0.0.1 -u root  --protocol=tcp --port=3360 -D jambones_test < ${__dirname}/../db/prepare-permissions-test.sql`, (err, stdout, stderr) => {
+    if (err) return t.end(err);
+    t.pass('permissions prepared');
+    t.end();
+  });
+});
 test('user tests', async(t) => {
   const app = require('../app');
   const password = 'abcde12345-';