This adds new `Runroot` class and new `runroot_method` option which makes
it possible to choose between two currently available runroot methods:
- Local
- Koji
The main goal of this commit is to make it possible to add new runroot
methods in the future and this is the first step in that direction.
Signed-off-by: Jan Kaluza <jkaluza@redhat.com>
Jan Kaluza