Changes to pass code check.
We should check NOXController and RemoteController to make sure thatthey are not broken, but I cannot do this at the moment.
Use IP address strings rather than hex number.
Removed underscores for public Node methods. Minor cleanup & comments.
Rename cliinfo debug level to output
Add none test to measure MN creation/teardown time
Fix remote controller param
Add TreeTopo to cmd line
Make cleanup a param of mn, not a separate script
Also switch from print to info statements, to enable a non-verboseclean. Instead of 'mnclean', now run 'mn -c'.
Slightly reduce cliinfo verbosity
Add flexible topology input parsing
Now you can pass a topology name followed by params. For example, tocreate a switch with 3 hosts:
sudo mn --topo single,3
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