ebs_volume_type missing parameters when set to 'io1'

[gmiranda23]

Using the following block_device mappings produces an error:

block_device_mappings:
  - ebs_device_name: /dev/sdb
    ebs_volume_type: io1
    ebs_virtual_name: test
    ebs_volume_size: 8
    ebs_delete_on_termination: true

$ bundle exec kitchen setup
-----> Starting Kitchen (v1.4.1.dev)
-----> Creating <default-centos-7>...
       Creating <>...

\>>>>>> ------Exception-------
\>>>>>> Class: Kitchen::ActionFailed
\>>>>>> Message: Failed to complete #create action: [The parameter iops must be specified for io1 volumes.]
\>>>>>> ----------------------
\>>>>>> Please see .kitchen/logs/kitchen.log for more details
\>>>>>> Also try running `kitchen diagnose --all` for configuration

I'm unable to find how that parameter should be set.

[tyler-ball]

@gmiranda23 They're talking about the iops parameter from http://docs.aws.amazon.com/sdkforruby/api/Aws/EC2/Client.html#create_image-instance_method - thanks for report, working on a PR now