There are three "deeper" changes included with this update:
1) The `Detach` function got removed from the `StorageActionsService` in
favor of `DetachByDropletID` (which is now used in
`resource_digitalocean_volume.go`).
2) The `Update` function got removed from `TagsService` (renaming a tag
has been deprecated in the API).
3) Every function in godo now takes a `context.Context` as first
argument, so I've changed all calls to send in a `context.Background()`.
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.
Jake Champlin