Add SSL_use_certiicate_chain file functions: this is works the same
way as SSL_CTX_use_certificate_chain_file but for an SSL structure.

Update SSL_CONF code to use the new function.
Update docs.
Update ordinals.
Reviewed-by: NRich Salz <rsalz@openssl.org>

Fix a limitation in SSL_CTX_use_certificate_chain_file(): use algorithm
specific chains instead of the shared chain.

Update docs.