test_csrgen: adjusted comparison test scripts for CSRGenerator
    
    Commit ada91c2 introduced changes in "csrgen/templates/openssl_base.tmpl"
    which broke the following 2 tests:
    
        test_CSRGenerator.test_userCert_OpenSSL
        test_CSRGenerator.test_caIPAserviceCert_OpenSSL
    
    The tests use files caIPAserviceCert_openssl.sh and userCert_openssl.sh
    as expected scripts in order to compare scripts generated by CSRGenerator.
    E.g. as other parameter was introduced we are now not checking with
    "if [[ $# -ne 2 ]]" but rather with if "[[ $# -lt 2 ]]".
    
    https://pagure.io/freeipa/issue/6724
    
    Reviewed-By: Milan Kubik <mkubik@redhat.com>
    Reviewed-By: Christian Heimes <cheimes@redhat.com>