IMDSv2 support

[condour]

Please specify whether your issue is about:

• a possible bug
• a question about package functionality
• a suggested code or documentation change, improvement to the code, or feature request

IMDS v2 requires that a token be requested prior to getting metadata. This should be a fairly simple fix - issue the token request prior to curling for the metadata. Thoughts?

[condour]

I've put in a PR for a fix.

[gs-scooter]

Can someone please review and merge this PR? This is a blocker for us.

[jb2cool]

We've stumbled across this too, this is impacting things for us where we are trying to follow best practice.

[condour]

Just a note that I've updated the branch to address PR comment.

[EwanStephens]

@condour @laurenkahn I see an approved PR for IMDSv2 support. Would it be possible to merge the PR? We also require IMDSv2 only on our EC2 instances and can't use this package without it. Thanks for your help!

[laurenkahn]

I don't have write access to merge. @leeper might need to merge?

[tyner]

Would be great to see this merged