More pylint fixes...
Remove trailing whitespace. ;-/
fixing no --nat issue
Updating NAT class to use gateway interface
Also, passing CLI args to NAT constructor
DemoCLI -> ClusterCLI
Correctly call cli() rather than CLI
fixing --custom in mn (there was one two many selfs)
Disable shared SSH connections by default.
Note that we do still provide a default if you specifyControlPath=True
Satisfy pyflakes by making a local cli variable
Remove obsolete util.custom(), and make custom() a method
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