Add hashkey slot to hold the key to unlock tar/rpm files via the web

server.

sql/database-create.sql

@@ -279,6 +279,7 @@ CREATE TABLE experiments (
   sync_server varchar(32) default NULL,
   cpu_usage tinyint(4) unsigned NOT NULL default '0',
   mem_usage tinyint(4) unsigned NOT NULL default '0',
+  keyhash varchar(64) default NULL,
   idx int(10) unsigned NOT NULL auto_increment,
   PRIMARY KEY  (eid,pid),
   KEY idx (idx),

sql/database-migrate.txt

@@ -970,3 +970,10 @@ last_net_act,last_cpu_act,last_ext_act);
 
        alter table widearea_nodeinfo add column hostname varchar(255);
        alter table widearea_nodeinfo add column site varchar(255);
+
+1.186: Add hashkey slot to experiments table to use as a secret key to
+       pass from the nodes to the webserver, to download tar/rpm
+       files.
+
+       alter table experiments add keyhash varchar(64) default NULL \
+		after mem_usage;