MOB-1806 Pin type parent

What can be chained? I think I'm confused here a little bit too :baby_chick: 

However, I saw your comment below according `$.nirvana.sendRequest()` and I think `getParentPinTypes()` can just return `$.nirvana.sendRequest()` result which is a `$.Deferred` instance and we don't need creation of another deferred objects inside `getParentPinTypes()`.