Workaround NSS bug in associating private key to certificate
    
    If NSS uses SQL DB storage, CERT_ImportCerts creates incomplete
    internal state (the cert isn't associated with the private key,
    and calling PK11_FindKeyByAnyCert returns no result).
    
    As a workaround, we import the cert again using PK11_ImportCert
    which magically fixes the issue.
    
    See rhbz#1532188
    
    Related: https://pagure.io/certmonger/issue/88