Fix kvm.pm not pulling in xCAT::Usage on its own

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@11617 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

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

@@ -12,6 +12,7 @@ use xCAT::VMCommon;
 use xCAT_monitoring::monitorctrl;
 
 use xCAT::Table;
+use xCAT::Usage;
 use XML::LibXML; #now that we are in the business of modifying xml data, need something capable of preserving more of the XML structure
 #TODO: convert all uses of XML::Simple to LibXML?  Using both seems wasteful in a way..
 use XML::Simple qw(XMLout);