test: debug fetch of CRLs

[Manuthor]

Du to reqwest/hyper error: connection closed before message completed:

• to minimize bad reuse idle connection from reqwest pool connection, configure reqwest builder as follow :

            client: builder
                .connect_timeout(Duration::from_secs(10))
                .timeout(Duration::from_secs(10))
                .tcp_keepalive(Duration::from_secs(5))
                .pool_idle_timeout(Duration::from_secs(5))
                .pool_max_idle_per_host(2)
                .default_headers(headers)
                .build()?,

• add retry strategy for getting CRL
• regenerate certificates with CRL dependencies (make the URL in https)

[Adamk93]

It seems fine to me!