Setting multiple non-default transport usernames per platform will soon be broken

[gmiranda23]

In resolving #136, I noticed that transport.username is now the preferred method for setting ssh transport usernames. Setting platform.driver.username appears to be deprecated, but that's currently the only way to set per platform exceptions that don't conform to bundled definitions in amis.json.

Example -- If in .kitchen.yml I set the following values

transport:
  ssh_key: /path/to/.ssh/private-key
  connection_timeout: 10
  connection_retries: 5
  username: ubuntu

platforms:
  - name: ubuntu-15.04
    driver:
      image_id: ami-83211eb3
  - name: centos-7
    driver:
      image_id: ami-c7d092f7
      username: ec2-user
  - name: fedora-22
    driver:
      image_id: ami-c16557f1
      username: fedora

And I run kitchen setup, I get the following errors:

$$$$$$ WARN: The driver[Kitchen::Driver::Ec2] config key `username` is deprecated, please use `transport.username`
$$$$$$ WARN: The driver[Kitchen::Driver::Ec2] config key `username` is deprecated, please use `transport.username`
$$$$$$ WARN: The driver[Kitchen::Driver::Ec2] config key `username` is deprecated, please use `transport.username`

But if platform.driver.username gets deprecated, there is no way to set the fedora username exception since it is 1) not in amis.json, 2) does not match the transport.username, and 3) is not 'root'.

Am I just missing how this is supposed to be correctly handled?

[tyler-ball]

You should be able to specify the following .kitchen.yml:

transport:
  ssh_key: /path/to/.ssh/private-key
  connection_timeout: 10
  connection_retries: 5
  username: ubuntu

platforms:
  - name: ubuntu-15.04
    driver:
      image_id: ami-83211eb3
  - name: centos-7
    driver:
      image_id: ami-c7d092f7
    transport:
      username: ec2-user
  - name: fedora-22
    driver:
      image_id: ami-c16557f1
    transport:
      username: fedora

Can you try that and see if it both gets rid of your warnings and uses the correct username?

[gmiranda23]

Verified to work. Feedback incorporated into #136