Satisfy pylint

examples/clusterdemo.py

@@ -3,7 +3,8 @@
 "clusterdemo.py: demo of Mininet Cluster Edition prototype"
 
 from mininet.examples.cluster import MininetCluster, SwitchBinPlacer
-from cluster import RemoteLink, RemoteSSHLink, RemoteGRELink
+from cluster import RemoteLink
+# Could also use: RemoteSSHLink, RemoteGRELink
 from mininet.topolib import TreeTopo
 from mininet.log import setLogLevel
 from mininet.examples.clustercli import ClusterCLI as CLI