IMDSv2 breaks plugin

[caspergasper]

Describe the bug
If IMDSv1 is disabled plugin doesn't work

To Reproduce
Steps to reproduce the behavior:

1. Spin up ec2 instance with HttpTokens required

aws ec2 describe-instances --instance-ids <instance_id> | jq '.Reservations[0].Instances[0].MetadataOptions.HttpTokens'

Logs
yum repolist
Loaded plugins: extras_suggestions, langpacks, priorities, s3iam, update-motd
Could not access AWS credentials

Expected behavior
S3 repos to work

Additional context
Looking at the code I can't see any support for tokens, it just seems to use imdsv1:

def get_role(self):
    """Read IAM role from AWS metadata store."""
    request = urllib2.Request(
        urlparse.urljoin(
            "http://169.254.169.254",
            "/latest/meta-data/iam/security-credentials/"
        ))