PR#4023: split out buildroot log watching logic
    
    Merges #4023
    https://pagure.io/koji/pull-request/4023
    
    Fixes: #4009
    https://pagure.io/koji/issue/4009
    RFE: Grab /var/log/dnf5.log from Mock buildroot
    
    Relates: #3875
    https://pagure.io/koji/issue/3875
    Log the macros enabled in side tag