Always collect test logs
    
    mh.install() is the default multi host installer. Most integration test
    classes use it to install master, replicas, and clients. In case of a
    failed installation, the test collector step is skipped.
    
    Guard log collection with a try/finally block so logs are always
    collected.
    
    Also collect journald output for mh.install() steps. The journal output
    was missing from installation logs and were only available in each test
    step.
    
    Signed-off-by: Christian Heimes <cheimes@redhat.com>