Add fields to support user directed Forgot My Password changes.

sql/database-create.sql

@@ -1443,6 +1443,8 @@ CREATE TABLE users (
   weblogin_failstamp int(10) unsigned NOT NULL default '0',
   plab_user tinyint(1) NOT NULL default '0',
   user_interface enum('emulab','plab') NOT NULL default 'emulab',
+  chpasswd_key varchar(32) default NULL,
+  chpasswd_expires int(10) unsigned NOT NULL default '0',
   PRIMARY KEY  (uid),
   KEY unix_uid (unix_uid),
   KEY status (status)

sql/database-migrate.txt

@@ -1120,3 +1120,9 @@ last_net_act,last_cpu_act,last_ext_act);
 
        alter table users add user_interface \
 		 enum('emulab','plab') NOT NULL default 'emulab';
+
+1.206: Add fields to support user directed Forgot My Password changes.
+
+       alter table users add chpasswd_key varchar(32) default NULL;
+       alter table users add chpasswd_expires int(10) unsigned \
+			NOT NULL default '0';