Fix for "rmnimimage -x" with error of "no nim object".

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@7400 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

perl-xCAT/xCAT/Utils.pm

@@ -3383,6 +3383,14 @@ sub get_ServiceNode
     	chomp $nimprime;
 	}
 
+	# $master and $nimprime is possible to be the same (MN)
+	# but $master is IP addr, $nimprime is short hostname
+	# this results in %snhash may have two keys duplicated.
+	# so use ip for nimprime.
+
+	my $nimprimeip = xCAT::NetworkUtils->getipaddr($nimprime);
+    $nimprime = $nimprimeip;
+
     $noderestab = xCAT::Table->new('noderes');
 	$nodetab = xCAT::Table->new('nodetype');