Use more python2- prefixed package in requires; Simplify providing binary of jenkins-jobs
    
    There is no point to provide both versions of the jenkins-jobs binary, because it does
    the same thing with the same result.
    
    Signed-off-by: Igor Gnatenko <ignatenko@redhat.com>
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1323989