Fixes failing acceptance test:
```
$ make testacc TEST=./builtin/providers/digitalocean TESTARGS='-run=TestAccDigitalOceanVolume_Droplet'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/01/20 11:38:26 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/digitalocean -v -run=TestAccDigitalOceanVolume_Droplet -timeout 120m
=== RUN TestAccDigitalOceanVolume_Droplet
--- PASS: TestAccDigitalOceanVolume_Droplet (57.38s)
PASS
ok github.com/hashicorp/terraform/builtin/providers/digitalocean 57.411s
```
Also removes all redundant type declarations in the digitalocean package.
```
make testacc TEST=./builtin/providers/digitalocean
TESTARGS='-run=TestAccDigitalOceanDomain_'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /vendor/)
TF_ACC=1 go test ./builtin/providers/digitalocean -v -run=TestAccDigitalOceanDomain_ -timeout 120m
=== RUN TestAccDigitalOceanDomain_importBasic
--- PASS: TestAccDigitalOceanDomain_importBasic (3.07s)
=== RUN TestAccDigitalOceanDomain_Basic
--- PASS: TestAccDigitalOceanDomain_Basic (1.99s)
PASS
ok github.com/hashicorp/terraform/builtin/providers/digitalocean
5.072s
```
Jake Champlin