4d9d3d5 [rpmbuild] fix reverted condition: yum.conf vs dnf.conf in config_opts for mock

Authored and Committed by clime 6 years ago
    [rpmbuild] fix reverted condition: yum.conf vs dnf.conf in config_opts for mock
    
    There seems to be a problem with usage of dnf.conf on f26 (KeyError encountered)
    dnf-2.6.3, mock-1.4.3 by memory