c500701 Add domain event for metadata changes

Authored and Committed by berrange 7 years ago
    Add domain event for metadata changes
    
    When changing the metadata via virDomainSetMetadata, we now
    emit an event to notify the app of changes. This is useful
    when co-ordinating different applications read/write of
    custom metadata.
    
    Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
    
        
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