Nomad server could have already purged the test job `foo` by the time the test checks to make sure the `foo` job has been deleted, resulting in a `404` response from the Nomad server.
```
$ make testacc TEST=./builtin/providers/nomad
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/05/04 15:51:01 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/nomad -v -timeout 120m
=== RUN TestProvider
--- PASS: TestProvider (0.00s)
=== RUN TestResourceJob_basic
--- PASS: TestResourceJob_basic (1.78s)
=== RUN TestResourceJob_refresh
--- PASS: TestResourceJob_refresh (3.30s)
=== RUN TestResourceJob_disableDestroyDeregister
--- PASS: TestResourceJob_disableDestroyDeregister (3.63s)
=== RUN TestResourceJob_idChange
--- PASS: TestResourceJob_idChange (3.44s)
=== RUN TestResourceJob_parameterizedJob
--- PASS: TestResourceJob_parameterizedJob (1.76s)
PASS
ok github.com/hashicorp/terraform/builtin/providers/nomad 13.924s
```
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