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mod_saslauth, mod_c2s: Disable tls-server-end-point channel binding by default This channel binding method is now enabled when a hash is manually set in the config, or it attempts to discover the hash automatically if the value is the special string "auto". A related change to mod_c2s prevents complicated certificate lookups in the client connection hot path - this work now happens only when this channel binding method is used. I'm not aware of anything else that uses ssl_cfg (vs ssl_ctx). Rationale for disabling by default: - Minor performance impact in automatic cert detection - This method is weak against a leaked/stolen private key (other methods such as 'tls-exporter' would not be compromised in such a case) Rationale for keeping the implementation: - For some deployments, this may be the only method available (e.g. due to TLS offloading in another process/server).