Renamed mn_run.py -> mn, mn_clean.py -> mnclean; updated Makefle

It's possible that mn_clean is a bit easier to read; mnclean may be easier
to type, however.

Added variables to Makefile so that source files are listed in a single
location.

bin/mnclean

@@ -0,0 +1,58 @@
+#!/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
+
+from mininet.xterm import cleanUpScreens
+
+
+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 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()