d6300dc cainstance: use correct certificate for replica install check

1 file Authored by tkrizek 7 years ago, Committed by mbasti 7 years ago,
    cainstance: use correct certificate for replica install check
    
    Incorrect certificate file extension caused DL0 replica install to fail.
    
    https://fedorahosted.org/freeipa/ticket/6461
    
    Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>