domainGenerator.py: more flexible arguments
domainGenerator.py: more flexible arguments

Allow optional arguments (initial settings, single domains, EDDs) to be passed
with an empty list of files.

This will make it a lot easier to write helper scripts.

Change-Id: I99527376b25d607616a3e73f6b62d556b79a90d2
Signed-off-by: David Wagner <60228a510f9a76940848fa2d29321fc4edfc2119@intel.com>

geekboxzone/mmallow_external_parameter-framework,geekboxzone/mmallow_external_parameter-framework,geekboxzone/mmallow_external_parameter-framework