The state is always JSON, in spite of the fact that this interface
presents it as an opaque byte array. It's more helpful to those interacting
with the state object outside of Terraform for it to have a more specific
content-type.
This change allows the user to specify `-backend-config="encrypt=1"`
to tell S3 to encrypt the data that's in the bucket when using S3
for remote config storage.
The encryption uses "Amazon S3-managed encryption keys" so it should
not require any further user intervention.
A line was added to the unit test just for coverage.
The acceptance test was modified to:
a) Use encryption
b) Push some test data up to the bucket created to ensure
that Amazon accepts the header.
This landed in aws-sdk-go yesterday, breaking the AWS provider in many places:
3c259c9586
Here, with much sedding, grepping, and manual massaging, we attempt to
catch Terraform up to the new `awserr.Error` interface world.
Jeff Mitchell