Revert "oem-ec2-compat: Check for metadata service and config drive"

The functionality for this in cloudinit 0.8.x is broken.

This reverts commit 91cc8446212c6b35c80cbdbbc204a9fe3cd1f756.
coreos-cloudinit: roll back to 0.7.7, the 0.8.x series still needs work.
Merge pull request #716 from marineam/rollback

Rollback to last working cloudinit