Add OVSBatch class (experimental)
This implements batch startup for OVS switches.
Add OVSLink/--link ovs, which uses OVS patch links when possible
Spacing tweaks for pep8 checker
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)
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