Load full certificate chain from a certificate chain file

Artem Boldariev requested to merge 2514-tls-cert-chain into main

This commit fixes loading the certificate chain files so that the full chain could be sent to the clients which require that for verification. Before that fix only the top most certificate would be loaded from the chain and sent to clients preventing some of them to perform certificate validation (e.g. Windows 10 DoH client).

Closes #2514 (closed)

Edited by Artem Boldariev

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