nodetool doesn't error when ~/.cassandra is inaccessible

Patch by Kirk True, reviewed by brandonwilliams for CASSANDRA-6449

src/java/org/apache/cassandra/tools/NodeTool.java

@@ -192,7 +192,7 @@ public class NodeTool
             SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss,SSS");
             writer.append(sdf.format(new Date())).append(": ").append(cmdLine).append(System.lineSeparator());
         }
-        catch (IOException ioe)
+        catch (IOException | IOError ioe)
         {
             //quietly ignore any errors about not being able to write out history
         }