etcdmain: exit after print out ErrDuplicateID

etcd should exit after printing log for unhandlable error.

etcdmain/etcd.go

@@ -141,7 +141,6 @@ func Main() {
 			plog.Errorf("But etcd could not find valid cluster configuration in the given data dir (%s).", cfg.dir)
 			plog.Infof("Please check the given data dir path if the previous bootstrap succeeded")
 			plog.Infof("or use a new discovery token if the previous bootstrap failed.")
-			os.Exit(1)
 		case discovery.ErrDuplicateName:
 			plog.Errorf("member with duplicated name has registered with discovery service token(%s).", cfg.durl)
 			plog.Errorf("please check (cURL) the discovery token for more information.")
@@ -162,6 +161,7 @@ func Main() {
 			}
 			plog.Fatalf("%v", err)
 		}
+		os.Exit(1)
 	}
 
 	osutil.HandleInterrupts()