When reading or deleting the google_project_service resource, first
retrieve the project. If it's not found, or if it's pending deletion,
remove the service, as it's functionally disabled.
Also, add a test to confirm the behaviour.
This should resolve#1292.
* Use errwrap to retain original error
* Use built-in Page function, only return names when listing services
This removes the custom logic on pagination and uses the built-in Page function in the SDK to make things a bit simpler. Additionally, I added a field filter to only return service names, which drastically reduces the size of the API call (important for slow connections, given how frequently this function is executed).
Also added errwrap to better trace where errors originate.
* Add helper function for diffing string slices
This just looked really nasty inline
* Batch 20 services at a time, handle precondition failed, better errwrap
This commit does three things:
1. It batches services to be enabled 20 at a time. The API fails if you try to enable more than 20 services, and this is documented in the SDK and API. I learned this the hard way. I think Terraform should "do the right thing" here and batch them in series' of twenty, which is what this does. Each batch is tried in serial, but I think making it parallelized is not worth the complexity tradeoffs.
2. Handle the precondition failed error that occurs randomly. This just started happened, but it affects at least two APIs consistently, and a rudimentary test showed that it failed 78% of the time (78/100 times in an hour). We should fix this upstream, but that failure rate also necessitates (in my opinion) some mitigation on the Terraform side until a fix is in place at the API level.
3. Use errwrap on errors for better tracing. It was really difficult to trace exactly which error was being throw. That's fixed.
* Updates from code review
* vendor service usage api
* use serviceusage api instead of servicemanagement for project services
* add bigquery-json to test
* add import for project service
* add serviceusage_operation.go
