ostree: Add URL to repo to message
    
    The message announcing new ostree commit contains hash of the commit,
    the ref it's for, but there is no information about where the repo
    actually is.
    
    This patch adds `repo_path` key into the message with URL of the repo
    and `local_repo_path` with path to the repo on local filesystem.
    
    Relates: https://pagure.io/pungi/issue/650
    Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>