Fixed clone error because of missing plugin.

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/branches/2.7@14613 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

xCAT-UI/xcat/plugins/webportal.pm

@@ -13,6 +13,7 @@ package xCAT_plugin::webportal;
 use strict;
 require xCAT::Utils;
 require xCAT::MsgUtils;
+require xCAT::zvmUtils;
 require xCAT::DBobjUtils;
 require IO::Socket::INET;
 use Getopt::Long;