report_job_results: handle cancelled jobs
    
    Summary:
    Cancelled jobs have their own state (at least in the openQA
    running on happyassassin, they do). This causes r_j_r to get
    stuck forever if any of the jobs are cancelled. Consider a
    cancelled job 'done'.
    
    Test Plan:
    Try submitting results for a set of jobs that includes one or
    more cancelled jobs. It should now work (before it would get
    stuck).
    
    Reviewers: jskladan, garretraziel
    
    Reviewed By: garretraziel
    
    Subscribers: tflink
    
    Differential Revision: https://phab.qadevel.cloud.fedoraproject.org/D492