Fix the regression after changes in 23f4d945

[mumoshu]

Hi,

Thanks for developing the great software :)

I have a fix for the regression in kitchen-ec2 on the master branch, which has occured after 23f4d94 (more specifically, the change in this line).

The regression is causing every kitchen test run eventually fails while trying to connect the newly created EC2 instance when you provided a value for the interface configuration parameter.

For instance, when you provided the value public for interface, kitchen test fails with the failure message:

>>>>>> ------Exception-------
>>>>>> Class: Kitchen::ActionFailed
>>>>>> Message: Failed to complete #create action: [undefined method `public' for #<Fog::Compute::AWS::Server:0x000000041bc430>]
>>>>>> ----------------------
>>>>>> Please see .kitchen/logs/kitchen.log for more details
>>>>>> Also try running `kitchen diagnose --all` for configuration

[tyler-ball]

Thanks for the catch! Better tests are next on my list, so this doesn't happen in the future.