c2023d5 openQA: try to make NFS mount changes more robust

Authored and Committed by adamwill 3 years ago
    openQA: try to make NFS mount changes more robust
    
    On client end, restart mount unit (with daemon-reload) if mount
    file changes. On server end, run exportfs -r if export config
    file changes.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>