Set options on the context.
void set_options( options o, asio::error_code & ec);
This function may be used to configure the SSL options used by the context.
A bitmask of options. The available option values are defined in
the ssl::context_base
class. The
options are bitwise-ored with any existing value for the options.
Set to indicate what error occurred, if any.
Calls SSL_CTX_set_options
.