Implements import with specified provider

[spangenberg]

This allows the import with a specified provider.
So far it was not possible to get resources imported from a different provider
than the default.

Example invocation that allows to import the specified AWS SQS queue with an AWS provider called "second":
terraform import -provider=aws.second aws_sqs_queue.fancy https://sqs.us-east-1.amazonaws.com/123456789101/fancy

This will fix #10029.

[mitchellh]

Really well done. I'm going to touch up some things a bit but this is agreat.

[jleclanche]

@mitchellh that command line argument should probably be mentioned in https://www.terraform.io/docs/import/usage.html and/or the error message - it's very confusing to get an error on an instance id not existing simply because it's outside the default provider.

[cregkly]

I ran into this issue and found the solution by searching and ending up on this page. The official documentation has not been updated.

In the example given there is a mistake. The provider needs to be in ""

terraform import -provider="aws.second" aws_sqs_queue.fancy https://sqs.us-east-1.amazonaws.com/123456789101/fancy

[pwhitehead00]

+1 on adding this to the documentation, I was only able to successfully import state with multiple providers only after finding this issue.

[ghost]

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