simple networks support

You can specify either a network UUID or network name.
Missing or misspelled networks will be ignored.
When provider.networks is not given, vagrant-tiktalik falls back
to default behavior of choosing a first available public network.

config.vm.provider :tiktalik do |provider, override|
       provider.networks = [
          [network name],
	  [network uuid1],
          [network uuid2],
       ]
end
return firs private ip if no public interfaces are found

This way we can create a 'gateway' machine and connect to it
using ssh.proxy_command

config.vm.define 'gateway' do |cfg|
  cfg.vm.provider :tiktalik do |provider, override|
  provider.networks = [
          "pub1",
          "priv1",
       ]
  end
end

config.vm.define "dc" do |cfg|
  cfg.ssh.proxy_command = "ssh -W %h:%p root@gateway.client.tiktalik.com"
  cfg.vm.provider :tiktalik do |provider, override|
    provider.networks = [
      "priv1"
    ]
  end
end
supprot cfg.ssh.proxy_command in sync_folders
Merge pull request #3 from wuub/master

simple networks support