Since use_cache is a bit weird, NodeRange will instead force a build_cache(1) instead

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/branches/2.7@12737 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

perl-xCAT/xCAT/NodeRange.pm

@@ -448,7 +448,7 @@ sub retain_cache { #A semi private operation to be used *ONLY* in the interestin
     $retaincache=shift;
     unless ($retaincache) { #take a call to retain_cache(0) to also mean that any existing
         #cache must be zapped
-        if ($nodelist) { $nodelist->_refresh_cache(); }
+        if ($nodelist) { $nodelist->_build_cache(1); }
 	$glstamp=0;
 	$allnodesetstamp=0;
 	$allgrphashstamp=0;