providers/heroku: import heroku_pipeline resource

[cmorent]

Adds support for importing pipelines with the heroku_pipeline resource.

Resolves #14485

[cmorent]

$ make testacc TEST=./builtin/providers/heroku
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/05/15 11:48:16 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/heroku -v  -timeout 120m
=== RUN   TestAccHerokuApp_importBasic
--- PASS: TestAccHerokuApp_importBasic (7.89s)
=== RUN   TestAccHerokuApp_importOrganization
--- SKIP: TestAccHerokuApp_importOrganization (0.00s)
	import_heroku_app_test.go:41: HEROKU_ORGANIZATION is not set; skipping test.
=== RUN   TestAccHerokuPipeline_importBasic
--- PASS: TestAccHerokuPipeline_importBasic (2.30s)
...

[catsby]

LGTM 👍 thanks!

[ghost]

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