add missing HEAD Bucket request, with a basic test in there
adding support for network interfaces and public IP association (non-default VPCs) for EC2 spot instances
Revert "adding support for network interfaces and public IP association (non-default VPCs) for EC2 spot instances"

This reverts commit 69a68a1809c63701ccd8670dd6fdb64a3fe9c4cb.
Merge pull request #3185 from CpuID/master

add missing HEAD Bucket request, with a basic test in there