Many apps deployed to Heroku require that multiple buildpacks be
configured in a particular order to operate correctly.
This updates the builtin Heroku provider's app resource to support
configuring buildpacks and the related documentation in the website.
Similar to config vars, externally set buildpacks will not be altered if
the config is not set.
Fixes: #13829
When IPv6 support was added to subnets, we added a new parameter that
had a default value. This means that users are experiencing unexpected
changes in their configuration
We need a schema migration in place to make sure this isn't the case for
the users who have not upgraded yet
```
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/04/23 10:36:43 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAWSSubnetMigrateState -timeout 120m
=== RUN TestAWSSubnetMigrateState
2017/04/23 10:37:27 [INFO] Found AWS Subnet State v0; migrating to v1
2017/04/23 10:37:27 [DEBUG] Attributes before migration: map[string]string{}
2017/04/23 10:37:27 [DEBUG] Attributes after migration: map[string]string{"assign_ipv6_address_on_creation":"false"}
--- PASS: TestAWSSubnetMigrateState (0.00s)
PASS
ok github.com/hashicorp/terraform/builtin/providers/aws 0.021s
```
Here we add a basic provider with a single resource type.
It's copied heavily from the `github` provider and `github_repository`
resource, as there is some overlap in those types/apis.
~~~
resource "gitlab_project" "test1" {
name = "test1"
visibility_level = "public"
}
~~~
We implement in terms of the
[go-gitlab](https://github.com/xanzy/go-gitlab) library, which provides
a wrapping of the [gitlab api](https://docs.gitlab.com/ee/api/)
We have been a little selective in the properties we surface for the
project resource, as not all properties are very instructive.
Notable is the removal of the `public` bool as the `visibility_level`
will take precedent if both are supplied which leads to confusing
interactions if they disagree.
