IMDSv2 compatibility

[kislyuk]

git grep 169.254

python3 -c 'import sys, botocore.utils as b; i=b.IMDSFetcher(); i._get_request(sys.argv[1], None, i._fetch_metadata_token()).text' latest/meta-data/hostname

aegea_imds(){ python3 -c 'import sys, botocore.utils as b; i=b.IMDSFetcher(); print(i._get_request(sys.argv[1], None, i._fetch_metadata_token()).text)' $@; }