Moved default injected file retrieval into its own behavior function

* Moved default injected file retrieval from the create_active_server
  behavior into a new behavior.This behavior is accessed in some tests
  that do not use the create_active_server behavior. By pulling this
  code into its own behavior function we can abstract this action and
  prevent some duplicate code
* Added call to get_default_injected_files in create_active_server

Change-Id: I544efb466f64c22db728cd10166eec3522a160d6
Merge "Moved default injected file retrieval into its own behavior function"