s_server: test ocsp with "-cert_chain"

Add a test to exercise the use of s_server with "-cert_chain" to
construct an ocsp request.

This new functionality was added in PR #22192.

s_server: test ocsp with "-cert_chain"

Add a test to exercise the use of s_server with "-cert_chain" to
construct an ocsp request.

This new functionality was added in PR #22192.

Testing:

make V=1 TESTS='test_ocsp_cert_chain' test

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/23101)

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