Generate PIN for PKI to help Dogtag in FIPS
    
    Dogtag is currently unable to generate a PIN it could use for
    an NSS database creation in FIPS. Generate it for them so that
    we don't fail.
    
    https://pagure.io/freeipa/issue/6824
    
    Reviewed-By: Tomas Krizek <tkrizek@redhat.com>