Various fixes to support autoqa and watcher execution on RHEL-5
    
     * autoqa.spec - Conditionally install python-hashlib on EL5 systems.  The
        hashlib library isn't included in python-2.4, but is packaged separately on
        EL5.
     * lib/python/bodhi_utils.py - one-line if else syntax isn't supported in
        python-2.4
     * lib/python/util.py - 'finally' syntax isn't supported in python-2.4