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 is done inorder to make the api tests **consistent** with ui/cli tests
3. Added pylint disables to make pylint happy for all the files in this commit
Good to know.

The code looks ugly when it extends more than 80 characters.  I will leave it for somebody else to make this change or refactor this code, if this is really needed.