Make sure vnames are unique per expt in the reserved table.

sql/database-create.sql

@@ -890,7 +890,7 @@ CREATE TABLE reserved (
   rsrv_time timestamp(14) NOT NULL,
   vname varchar(32) default NULL,
   PRIMARY KEY  (node_id),
-  KEY pid (pid,eid)
+  UNIQUE KEY vname (pid,eid,vname)
 ) TYPE=MyISAM;
 
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