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.