Previously lightsail was limited to `us-east-1` only. This restriction has now been lifted to new regions.
```
$ make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSLightsailInstance_euRegion'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/05/19 16:40:48 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSLightsailInstance_euRegion -timeout 120m
=== RUN TestAccAWSLightsailInstance_euRegion
--- PASS: TestAccAWSLightsailInstance_euRegion (45.31s)
PASS
ok github.com/hashicorp/terraform/builtin/providers/aws 45.319s
```
Fixes: #14668