ipatests: collect log after ipa-ca-install
    
    Make sure logs are collected after calling ipa-ca-install command.
    
    Related: https://pagure.io/freeipa/issue/7060
    
    Signed-off-by: Tomas Krizek <tkrizek@redhat.com>
    Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>