fixed defect:2817344. getmac -C option should not work with noderange. Otherwise, muiltiple computes nodes will use the same IP and ping the same management nodes

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@3726 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

perl-xCAT/xCAT/PPCmac.pm

@@ -90,6 +90,9 @@ sub parse_args {
         }
 
         if ( exists($opt{C}) ) {
+            if ( scalar(@$node) > 1 ) {
+                return( [RC_ERROR,"Option '-C' doesn't work with noderange\n"] );
+            }
             push @network, $_;
         } else {
             # get, check the node IP