Style changes in mininet/node.py and removing used import in mininet/link.py

mininet/link.py

@@ -26,7 +26,7 @@ Link: basic link class for creating veth pairs
 
 from mininet.log import info, error, debug
 from mininet.util import makeIntfPair, quietRun
-from time import sleep
+#from time import sleep
 import re
 
 class Intf( object ):

mininet/node.py

@@ -619,8 +619,8 @@ class CPULimitedHost( Host ):
         return Host.popen( self, *args, mncmd=mncmd, **kwargs )
 
     def cleanup( self ):
-        super(CPULimitedHost, self).cleanup()
-        "Clean up our cgroup"
+        "Clean up Node, then clean up our cgroup"
+        super( CPULimitedHost, self ).cleanup()
         retry( retries=3, delaySecs=1, fn=self.cgroupDel )
 
     def chrt( self ):