internal/providers/aws: fix panic when an IMDSv2 token is present
internal/providers/aws: fix panic when an IMDSv2 token is present

We are passing an empty `FetchOptions` object to the
`fetchFromAWSMetadata` function as we have yet to fetch the actual
config. This function attempts to append the IMDSv2 token to the HTTP
headers if it is fetched which panics assigning to a nil map.

coreos/ignition,coreos/ignition,coreos/ignition