671127f rpmbuild: don't override isolation config by default

Authored and Committed by praiskup 3 years ago
    rpmbuild: don't override isolation config by default
    
    The default --isolation in Mock is 'auto'.  But e.g. epel-6 has
    the isolation explicitly set to 'simple' (because 'nspawn' is known to
    not work correctly).
    
    So doing isolation=auto in copr-rpmbuild for the "default" value would
    effectively mean that we are switching to isolation=auto also the epel-6
    in Copr (which would in turn mean we would use non-working
    isolation=nspawn).
    
    Fixes: #1603
    
        
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