Added allowfixnode flag in the experiments table for Tim so he can tweak

vnode weights (like CPU) and do a swapmod. This is a hammer but will do
for now.

sql/database-create.sql

@@ -283,6 +283,8 @@ CREATE TABLE experiments (
   eventkey varchar(64) default NULL,
   idx int(10) unsigned NOT NULL auto_increment,
   sim_reswap_count smallint(5) unsigned NOT NULL default '0',
+  veth_encapsulate tinyint(4) NOT NULL default '1',
+  allowfixnode tinyint(4) NOT NULL default '0',
   PRIMARY KEY  (eid,pid),
   KEY idx (idx),
   KEY batchmode (batchmode)

sql/database-migrate.txt

@@ -1251,3 +1251,9 @@ last_net_act,last_cpu_act,last_ext_act);
 	alter table images add frisbee_pid int(11) default '0' \
 		after load_address;
 
+1.220: Add allowfixnode flag to experiments table so it can be turned off.
+       This is useful when a user changes the vnode resources (such as cpu) 
+       for a vnode and then does a swapmod.
+
+         alter table experiments add allowfixnode tinyint(4) \ 
+	       not null default 1;