Previously, groups were granted launch permissions by submitting a
ModifyImageAttribute request with the UserGroups parameter set
appropriately. This is no longer valid, as the LaunchPermission
parameter must be set.

InvalidBlockDeviceMapping

Fix failing AMI snapshot tagging when copying to other regions.

Fix for tag creation when creating new ec2 instance.

- Changed config from pointer to value to fix crash
- Removed acceptance flag from compress tests since they would have
caught this

builder/amazon: Fix issue with sharing AMIs with ami_users

clean up character encodings

website: Fix DigitalOcean section of getting started docs.

This updates the example for adding DigitalOcean
as a provider in the beginning tutorial. It looks
like it hadn't been updated in some time, and
was using old settings. I've updated it and
confirmed it works.

helper/communicator: support disabling SSH agent

builder/amazon-chroot: add mount_options configuration option

builder/qemu: default acceleration to tcg on Windows [GH-2284]

builder/amazon-chroot: various fixing and debugging of chroot builder

fix file download provisioner