Make some heat resolve functions workable in hot

Make resolve functions Ref, Fn::GetAtt, Fn::Replace workable in hot.

Fixes bug #1221017

Change-Id: I9b7ca58720b3c7d157c79c3756510ebc62d81ee5
Add HOT functions to dependency checks

Fixes bug 1223035

Change-Id: I7859a59490151885d4efe9bd36c612474d45b5f5
Merge "Make some heat resolve functions workable in hot"