Allows the ssh-key test to pass when ran in parallel with different branches.
```
$ make testacc TEST=./builtin/providers/packet TESTARGS='-run=TestAccPacketSSHKey_Basic'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/03/14 11:10:28 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/packet -v -run=TestAccPacketSSHKey_Basic -timeout 120m
=== RUN TestAccPacketSSHKey_Basic
PASS
ok github.com/hashicorp/terraform/builtin/providers/packet 3.503s
```
When a Packet provision exceeds our time limit, we move the device to an
internal project for Packet staff to investigate. When this happens, the
original user no longer has access to the device, and they get a 403.
These changes make that and other external state changes more pleasant for
users of Terraform.