add :type to RS LoadBalancers nodes

This is cleaned up and 'works for me'

I used  Charles Proxy to debug traffic generate the gists

https://gist.github.com/hh/d9cbd23097d42db7e531

'''ruby
c=Fog::Rackspace::LoadBalancers.new(rackspace_region: :dfw,
  connection_options: {ssl_verify_peer: false, proxy: 'http://localhost:8888'})
lb=s.load_balancers.find {|lb| lb.name == 'testhttp'} 
'''

'''pry
[2] pry(main)> lb.nodes
=> [  <Fog::Rackspace::LoadBalancers::Node
    id=592343,
    address="72.32.12.183",
    status="OFFLINE",
    weight=1,
    port=80,
    type="PRIMARY",
    condition="ENABLED"
  >,
   <Fog::Rackspace::LoadBalancers::Node
    id=592345,
    address="98.129.97.72",
    status="ONLINE",
    weight=1,
    port=80,
    type="SECONDARY",
    condition="ENABLED"
  >,
   <Fog::Rackspace::LoadBalancers::Node
    id=712997,
    address="10.179.69.183",
    status="OFFLINE",
    weight=1,
    port=80,
    type="PRIMARY",
    condition="ENABLED"
  >]
[3] pry(main)> lb.nodes.last.type="SECONDARY"
=> "SECONDARY"
[4] pry(main)> lb.nodes.last.save
=> true
[5] pry(main)> s.load_balancers.find {|lb| lb.name == 'testhttp'}.nodes
=> [  <Fog::Rackspace::LoadBalancers::Node
    id=592343,
    address="72.32.12.183",
    status="OFFLINE",
    weight=1,
    port=80,
    type="PRIMARY",
    condition="ENABLED"
  >,
   <Fog::Rackspace::LoadBalancers::Node
    id=592345,
    address="98.129.97.72",
    status="ONLINE",
    weight=1,
    port=80,
    type="SECONDARY",
    condition="ENABLED"
  >,
   <Fog::Rackspace::LoadBalancers::Node
    id=712997,
    address="10.179.69.183",
    status="OFFLINE",
    weight=1,
    port=80,
    type="SECONDARY",
    condition="ENABLED"
  >]

'''