migrate from standard to dvswitch
* 'simultaneously' move management port and uplinks
* remove pnics from standard switch
* add pnics to uplink dvportgroup
* move vmknics from standard portgroup to dvportgroup
* useful when host has limited uplinks, no secondary management capability

vc_dvswitch_migrate.pp
* dvswitch create
* dvswitch configure
* dvportgroup create and configure
* dvswitch add host
* migrate uplinks and vmk0
Merge pull request #111 from rbbrown/tb/migrate2dvs

migrate uplinks and vmknics to dvswitch