coreos-cloudinit: roll forward to 0.8.6

We may have the last of the issues sorted...

This reverts commit b34d0a3308 and 20aa920e7f.
oem-ec2-compat: remove dependency on coreos-setup-environment

The coreos-setup-environment no longer generates /etc/environment on
systems using this OEM package so remove the requirement.
Merge pull request #719 from marineam/no-env

Remove environment dependency, roll forward again.