Do not rely on Ceph extensions in head bucket
Do not rely on Ceph extensions in head bucket

This commit allows test_bucket_head test_bucket_head,
test_bucket_head_extended, test_multipart_upload, and
test_abort_multipart_upload to succeed against AWS-S3.  Also use
public buckets for head tests since they do not require private
buckets.

Signed-off-by: Andrew Gaul <02e0a999c50b1f88df7a8f5a04e1b76b35ea6a88@gaul.org>

ceph/s3-tests,smithfarm/s3-tests,ceph/s3-tests,andrewgaul/s3-tests,smithfarm/s3-tests,dreamhost/s3-tests,jmunhoz/s3-tests,Intel-bigdata/s3-tests,tobegit3hub/s3-tests,jmunhoz/s3-tests,robbat2/s3-tests,Intel-bigdata/s3-tests,robbat2/s3-tests,timuralp/s3-tests,andrewgaul/s3-tests,dreamhost/s3-tests,timuralp/s3-tests,tobegit3hub/s3-tests