RhBug: 977753

We forgot "pkg." in repository output.py..
$ dnf info nano && dnf info vim-common && dnf install vim-common
Installed Packages
...
Repo        : @System
...

Available Packages
...
Repo        : updates-testing
...

...
Installing:
 vim-common         x86_64     2:7.3.944-1.fc19       updates-testing     5.5 M
 vim-filesystem     x86_64     2:7.3.944-1.fc19       updates-testing      12 k
...