MEDIUM: config: replace ssl_conf by bind_conf

Some settings need to be merged per-bind config line and are not necessarily
SSL-specific. It becomes quite inconvenient to have this ssl_conf SSL-specific,
so let's replace it with something more generic.
diff --git a/include/proto/ssl_sock.h b/include/proto/ssl_sock.h
index 6192fe8..4bff954 100644
--- a/include/proto/ssl_sock.h
+++ b/include/proto/ssl_sock.h
@@ -30,11 +30,11 @@
 
 extern struct data_ops ssl_sock;
 int ssl_sock_handshake(struct connection *conn, unsigned int flag);
-int ssl_sock_load_cert(char *path, struct ssl_conf *ssl_conf, struct proxy *proxy);
-int ssl_sock_prepare_ctx(struct ssl_conf *ssl_conf, SSL_CTX *ctx, struct proxy *proxy);
-void ssl_sock_free_certs(struct ssl_conf *ssl_conf);
-int ssl_sock_prepare_all_ctx(struct ssl_conf *ssl_conf, struct proxy *px);
-void ssl_sock_free_all_ctx(struct ssl_conf *ssl_conf);
+int ssl_sock_load_cert(char *path, struct bind_conf *bind_conf, struct proxy *proxy);
+int ssl_sock_prepare_ctx(struct bind_conf *bind_conf, SSL_CTX *ctx, struct proxy *proxy);
+void ssl_sock_free_certs(struct bind_conf *bind_conf);
+int ssl_sock_prepare_all_ctx(struct bind_conf *bind_conf, struct proxy *px);
+void ssl_sock_free_all_ctx(struct bind_conf *bind_conf);
 
 #endif /* _PROTO_SSL_SOCK_H */