Include the chroot in the description of finished builds on copr
Adjust the unit-test for copr messages to reflect the addition of the chroot on the finished build message

Fixes https://github.com/fedora-infra/fedmsg_meta_fedora_infrastructure/issues/117#issuecomment-49036853
Merge pull request #118 from fedora-infra/endbuild_chroot

Endbuild chroot