Add a new option, `use_sftp` to the ansible provisioner. It's default
value is false; ansible provisioner will use SCP by default.
Refactor to consistently set all configure options for ansible
provisioner in the Prepare step.
Remove incorrect information about `ANSIBLE_HOST_KEY_CHECKING=False`
being set when `ansible_env_vars` is not set in the packer template.
Update BATS tests for the ansible provisioner to actually check that the
fetched directory contains the contents expected. This revealed a
problem with the all_options template that required adding a host to the
hosts list in the test playbook.
Handle running `scp -t` and `scp -f` exec requests in the
ansible-provisioner's SSH
server to allow Ansible to use SCP so that SFTP doesn't have to be
installed on the node.
Update the BATS tests to test the ansible provisioner.
Add bats tests for the ansible provisioner. The tests exercise all
options and the minimal set of options of the provisioner.
Fix the bats tests for the googlecompute builder.
