Add special tool that gathers given modules.tar.gz files
and collects information about modules into two dirs:
- module_defaults
- modules
First one is used by pungi during repocreate phase and
the second one is used by koji mock to get list of
available modules and their versions.
Change-Id: I50a095a5f3bafa7e7a1effc2c0d4a2fc52ba603b
