Auto-install run and clean scripts

Also remove usused imports and outdated doc text.

bin/mn_clean.py

@@ -0,0 +1,65 @@
+#!/usr/bin/env python
+"""Mininet Cleanup
+
+@author Bob Lantz (rlantz@cs.stanford.edu)
+
+Unfortunately, Mininet and OpenFlow don't always clean up
+properly after themselves. Until they do (or until cleanup
+functionality is integrated into the python code), this
+script may be used to get rid of unwanted garbage. It may
+also get rid of 'false positives', but hopefully nothing
+irreplaceable!
+"""
+
+from subprocess import Popen, PIPE
+import re
+
+from mininet.util import quietRun
+
+def sh( cmd ): 
+   "Print a command and send it to the shell"
+   print cmd
+   return Popen( [ '/bin/sh', '-c', cmd ], 
+      stdout=PIPE ).communicate()[ 0 ]
+
+def cleanUpScreens():
+   "Remove moldy old screen sessions."      
+   r = r'(\d+.[hsc]\d+)'
+   output = sh( 'screen -ls' ).split( '\n' )
+   for line in output:
+      m = re.search( r, line )
+      if m is not None:
+         quietRun( 'screen -S ' + m.group( 1 ) + ' -X kill' )
+ 
+def cleanup():
+   """Clean up junk which might be left over from old runs;
+      do fast stuff before slow dp and link removal!"""
+      
+   print "*** Removing excess controllers/ofprotocols/ofdatapaths/pings/noxes"
+   zombies = 'controller ofprotocol ofdatapath ping nox_core lt-nox_core '
+   zombies += 'udpbwtest'
+   # Note: real zombie processes can't actually be killed, since they 
+   # are already (un)dead. Then again,
+   # you can't connect to them either, so they're mostly harmless.
+   sh( 'killall -9 ' + zombies + ' 2> /dev/null' )
+
+   print "*** Removing junk from /tmp"
+   sh( 'rm -f /tmp/vconn* /tmp/vlogs* /tmp/*.out /tmp/*.log' )
+
+   print "*** Removing old screen sessions"
+   cleanUpScreens()
+
+   print "*** Removing excess kernel datapaths"
+   dps = sh( "ps ax | egrep -o 'dp[0-9]+' | sed 's/dp/nl:/'" ).split( '\n')
+   for dp in dps: 
+      if dp != '': sh( 'dpctl deldp ' + dp )
+      
+   print "*** Removing all links of the pattern foo-ethX"
+   links = sh( "ip link show | egrep -o '(\w+-eth\w+)'" ).split( '\n' )
+   for link in links: 
+      if link != '': sh( "ip link del " + link )
+
+   print "*** Cleanup complete."
+
+if __name__ == "__main__":
+   cleanup()