Add a test for BIO_s_mem() when using datagrams

The previous commit added support to BIO_s_mem() for using datagrams. We
now add tests for that functionality.

Reviewed-by: Tomas

Add a test for BIO_s_mem() when using datagrams

The previous commit added support to BIO_s_mem() for using datagrams. We
now add tests for that functionality.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Hugo Landau <hlandau@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18596)

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