250e2e6 container-build: support yum repos with --build-with=koji

Authored and Committed by pbabinca 8 years ago
    container-build: support yum repos with --build-with=koji
    
    Support was introduced in dock (dock-1.0.0.a-1-234-g3fc3a42) by commit:
    
        3fc3a42 New add_yum_plugin_by_url pre-build plugin.
    
        
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