Add networking vm net up/down functionality
user
```ruby
#
# Author:: Raducu Deaconu (<rhadoo_io@yahoo.com>)
# License:: Apache License, Version 2.0
#
require 'chef/knife'
require 'chef/knife/base_vsphere_command'
# Switch VM networking state up/down (on all network interfaces)
class Chef::Knife::VsphereVmNet < Chef::Knife::BaseVsphereCommand
  banner "knife vsphere vm net STATE VMNAME"
  get_common_options
  def run
    $stdout.sync = true
    vmname = @name_args[1]
    if vmname.nil?
      show_usage
      fatal_exit("You must specify a virtual machine name")
    end

state = @name_args[0]
    if state.nil?
      show_usage
      fatal_exit("You must specify networking state up/down")
    end

if state=="up"
if_state=true
elsif state=="down"
if_state=false
end
vim = get_vim_connection
dc=get_datacenter
folder = find_folder(get_config(:folder)) || dc.vmFolder
vm = find_in_folder(folder, RbVmomi::VIM::VirtualMachine, vmname) or
abort "VM #{vmname} not found"
vm.config.hardware.device.each.grep(RbVmomi::VIM::VirtualEthernetCard) do |a|
backing=a.backing
key= a.key

puts "#{ui.color("Setting network adapter", :cyan)} :#{a.deviceInfo.label} on vlan :#{a.deviceInfo.summary} :#{state}"

conninfo=RbVmomi::VIM.VirtualDeviceConnectInfo(:startConnected => true,
                                               :allowGuestControl => true,
                                               :connected => if_state)

ndevice = RbVmomi::VIM.VirtualE1000(:key => key,
                                    :backing => backing,
                                    :connectable => conninfo)

device_spec = RbVmomi::VIM.VirtualDeviceConfigSpec(:operation => :edit,
                                                   :device => ndevice)

vmspec = RbVmomi::VIM.VirtualMachineConfigSpec(:deviceChange =>[device_spec])

vm.ReconfigVM_Task(:spec => vmspec).wait_for_completion
end
end
end
```
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