ec096d2 Refine command override create

Authored and Committed by cqi 5 years ago
    Refine command override create
    
    * Pass username to BodhiClient class
    * Use datetime.utcnow instead of datetime.now, which is same as
      what bodhi-client API does
    * Print created override by call to BodhiClient.override_str rather than
      printing by fedpkg itself
    * Show fedpkg or fedpkg-stage in description accordingly
    * Update tests.
    
    Signed-off-by: Chenxiong Qi <cqi@redhat.com>
    
        
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