Fix SSL certificate handling & minor printf format fixes #254
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Always load CA certificates if available.
Use
SSL_CTX_use_certificate_chain_file()
to load our public certifcateto allow loading intermediate & root CAs.
Verify that certificate & private key match.
This allows us to present the full certificate chain during handshake
with the intermediate & root CAs stored in either the CA file or
certificate file or a combination thereof.