CFY-1500 update get attribute validate to allow all scopes and change some validations + add tests
CFY-1500 add validations for node template scope and relationships scope
CFY-1500 refactor
CFY-1500 add has_attribute property to operation inputs
CFY-1500 implement process attributes function
CFY-1500 refactor evaluate_outputs to use process_attributes
CFY-1500 add support for list index in nested property
CFY-1500 add unit test for process_attributes
CFY-1500 add support for fallback to node properties on missing attribute
CFY-1500 fix type reference
CFY-1500 rename process attributes to evaluate functions
Merge pull request #35 from cloudify-cosmo/CFY-1500-get-attribute

Cfy 1500 get attribute