add various koji functions to work with repos
add various koji functions to work with repos

Koji create repos through newRepo() but it doesn't create SRPMs repo
(not even for one acrchitecture), so we need to find which SRPMs
do we have in there.

Signed-off-by: Igor Gnatenko <b1e1b556340449c9045a39d8fd6283e01a8ec492@fedoraproject.org>

fedora-modularity/baseruntime-package-lists,fedora-modularity/baseruntime-package-lists,sgallagher/baseruntime-package-lists,sgallagher/baseruntime-package-lists,sgallagher/baseruntime-package-lists,fedora-modularity/baseruntime-package-lists