A single place for providing test defaults

[anujgandharv]

EasyTest supports a lot of custom features for its users to provide and work with.
This task is to identify what can be treated as TestDefaults that potentially are same across all the tests for different users.
For example, a user may want to specify the writeData property value just once instead of specifying it for each test class or even as part of TestPolicy annotation.
A user may want to specify Format properties only once instead of specifying it for each test class or even as part of TestPolicy annotation.

And other scenarios.