Multiple updates to api tests
1. Removed references to decorators.($func) by importing them directly
2. Imported ddt.data as ddt_data to differentiate it from decorators.data - This change will make the api tests consistent with ui/api tests
3. Added pylint disables to make pylint happy for all the files in this commit
Merge pull request #1557 from sthirugn/organize_import

Multiple updates to api tests