EKS Metadata Tests Not Working

[marcwickenden]

From what I can tell, it's not easy to mock the AWS Go SDK ec2metadata.New(). There's commented out code from where I tried to write a wrapper for this but, while it worked in the tests, running inside AWS this threw a segfault.

I expect it's fixable but at the moment it means we've got no tests for getUserData() in eks.go.