MINOR: peers: centralize configuration of the peers frontend

This is in order to stop exporting the peer_accept() function.
diff --git a/include/proto/peers.h b/include/proto/peers.h
index 349fda5..39835ff 100644
--- a/include/proto/peers.h
+++ b/include/proto/peers.h
@@ -29,8 +29,7 @@
 #include <types/peers.h>
 
 void peers_register_table(struct peers *, struct stktable *table);
-
-int peer_accept(struct session *);
+void peers_setup_frontend(struct proxy *fe);
 
 #endif /* _PROTO_PEERS_H */