1951b47 Backport PR#848: use subprocess.Popen instead of subprocess.check_output

Authored and Committed by mikem a year ago
    Backport PR#848: use subprocess.Popen instead of subprocess.check_output
    
    https://pagure.io/koji/pull-request/848
    
    https://pagure.io/koji/issue/846
    error occurs in SCM.get_source since subprocess.check_output is not supported by python 2.6-
    
        
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