-Add strict to conserver plugin

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@1905 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

xCAT-server/lib/xcat/plugins/conserver.pm

@@ -1,6 +1,7 @@
 # IBM(c) 2007 EPL license http://www.eclipse.org/legal/epl-v10.html
 #TODO: delete entries not being refreshed if no noderange
 package xCAT_plugin::conserver;
+use strict;
 use xCAT::Table;
 use xCAT::Utils;
 use Getopt::Long;