Fix regression with session cache use by clients
Commit d316cdcf introduced some extra checks into the session-cache update procedure, intended to prevent the caching of sessions whose resumption would lead to a handshake failure, since if the server is authenticating the client, there needs to be an application-set "session id context" to match up to the authentication context. While that change is effective for its stated purpose, there was also some collatoral damage introduced along with the fix -- clients that set SSL_VERIFY_PEER are not expected to set an sid_ctx, and so their usage of session caching was erroneously denied. Fix the scope of the original commit by limiting it to only acting when the SSL is a server SSL. Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/5967)
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