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/index.js

@@ -13,6 +13,7 @@ require('./ms-teams');
 require('./speech-credentials');
 require('./recent-calls');
 require('./users');
+require('./users-view-only');
 require('./login');
 require('./webapp_tests');
 // require('./homer');