fixing CLI host rewriting when host's default interface does not have an IP
2.1.0 -> 2.1.0+
Fix regex to support Mininet 20.30.40+++
Minor codecheck fixes
adding noneTest to Mininet vm build script
Merge branch 'master' of github.com:mininet/mininet
adding output file to build.py
node: kill entire process group in terminate

mnexec already puts the shell into its own process group. Killing the entire
process group cleans up after any background processes the user left running.
Merge pull request #250 from rlane/killpg

kill entire process group in Node.terminate
Close the file when done with it.
Correct the comments of do_pingallfull() and do_iperfudp()