Change the current_speed enum in the interfaces table to allow "0" as

a legal value; when interfaces are not in use, set the speed to 0.

sql/database-create.sql

@@ -526,7 +526,7 @@ CREATE TABLE interfaces (
   interface_type varchar(30) default NULL,
   iface text NOT NULL,
   role enum('ctrl','expt','jail','fake','other','gw') default NULL,
-  current_speed enum('100','10','1000') NOT NULL default '100',
+  current_speed enum('0','10','100','1000') NOT NULL default '100',
   duplex enum('full','half') NOT NULL default 'full',
   rtabid smallint(5) unsigned NOT NULL default '0',
   vnode_id varchar(32) default NULL,

sql/database-migrate.txt

@@ -1734,3 +1734,10 @@ last_net_act,last_cpu_act,last_ext_act);
         alter table experiments add modelnetedge_osname varchar(20) \
 		default NULL after modelnetcore_osname;
 
+1.262: Change the current_speed enum in the interfaces table to allow "0"
+       as a legal value; when interfaces are not in use, set the speed
+       to 0.
+
+	alter table interfaces change current_speed \
+              current_speed enum('0','10','100','1000') \
+	      NOT NULL default '0';