Cart Shipping Address and Method Fixes

[pmclain]

Description (*)

• Makes cart address id available for shipping addresses (this is required for setting shipping methods)
• Corrects validation in SetShippingMethodsOnCart resolver to match schema updates fa5613b#diff-795a33fde881f18aba5165a5a8c7513fL68

Manual testing scenarios (*)

1. Create quote and set shipping address
2. Query cart requesting shipping address id

query getCart($cartId:String!){
  cart(cart_id:$cartId){
    cart_id
    shipping_addresses{
      address_id
    }
  }
}

3. Set shipping method for returned shipping address(es)

mutation setShippingMethod($cartId:String!, $addressId:Int!){
  setShippingMethodsOnCart(
    input:{
      cart_id:$cartId
      shipping_methods:[
        {
          cart_address_id:$addressId
          carrier_code:"flatrate"
          method_code:"flatrate"
        }
      ]
    }
  ) {
    cart{
      items{
        id
      }
    }
  }
}

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[rogyar]

Please note. The shipping methods changes are already applied in a scope of the following PR
#342

[ghost]

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