MAJOR: peers: allow peers section to be used with nbproc > 1

This only works when the peers are bound to exactly one process.
diff --git a/src/cfgparse.c b/src/cfgparse.c
index aa03995..e8004c6 100644
--- a/src/cfgparse.c
+++ b/src/cfgparse.c
@@ -6550,12 +6550,6 @@
 			}
 		}
 
-		if (global.nbproc > 1 && curproxy->table.peers.name) {
-			Alert("Proxy '%s': peers can't be used in multi-process mode (nbproc > 1).\n",
-			      curproxy->id);
-			cfgerr++;
-		}
-
 		switch (curproxy->mode) {
 		case PR_MODE_HEALTH:
 			cfgerr += proxy_cfg_ensure_no_http(curproxy);