We now enable the final_snapshot of aws_rds_cluster by default. This is
a continuation of the work in #11668
```
% make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSRDSCluster_takeFinalSnapshot'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/02/04 13:19:52 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSRDSCluster_takeFinalSnapshot -timeout 120m
=== RUN TestAccAWSRDSCluster_takeFinalSnapshot
--- PASS: TestAccAWSRDSCluster_takeFinalSnapshot (141.59s)
PASS
ok github.com/hashicorp/terraform/builtin/providers/aws 141.609s
```
Previously, an `aws_rds_cluster` that contains active instance groups would timeout on a destroy, if the destroy was able to only target the rds_cluster and not include the instance groups.
This would result in a `400` response from AWS, and Terraform would sit in a wait-loop until a 15-minute timeout while waiting for the cluster to be destroyed.
This catches the error returned from the `DeleteDBCluster` function call such that the proper error case can be returned to the user.
`400` from the AWS API:
```
2017/02/08 13:40:47 [DEBUG] plugin: terraform: ---[ RESPONSE ]--------------------------------------
2017/02/08 13:40:47 [DEBUG] plugin: terraform: HTTP/1.1 400 Bad Request
2017/02/08 13:40:47 [DEBUG] plugin: terraform: Connection: close
2017/02/08 13:40:47 [DEBUG] plugin: terraform: Content-Length: 337
2017/02/08 13:40:47 [DEBUG] plugin: terraform: Content-Type: text/xml
2017/02/08 13:40:47 [DEBUG] plugin: terraform: Date: Wed, 08 Feb 2017 18:40:46 GMT
2017/02/08 13:40:47 [DEBUG] plugin: terraform: X-Amzn-Requestid: 1b4a76cc-ee2e-11e6-867d-2311ebaffd3e
2017/02/08 13:40:47 [DEBUG] plugin: terraform:
2017/02/08 13:40:47 [DEBUG] plugin: terraform: <ErrorResponse xmlns="http://rds.amazonaws.com/doc/2014-10-31/">
2017/02/08 13:40:47 [DEBUG] plugin: terraform: <Error>
2017/02/08 13:40:47 [DEBUG] plugin: terraform: <Type>Sender</Type>
2017/02/08 13:40:47 [DEBUG] plugin: terraform: <Code>InvalidDBClusterStateFault</Code>
2017/02/08 13:40:47 [DEBUG] plugin: terraform: <Message>Cluster cannot be deleted, it still contains DB instances in non-deleting state.</Message>
2017/02/08 13:40:47 [DEBUG] plugin: terraform: </Error>
2017/02/08 13:40:47 [DEBUG] plugin: terraform: <RequestId>1b4a76cc-ee2e-11e6-867d-2311ebaffd3e</RequestId>
2017/02/08 13:40:47 [DEBUG] plugin: terraform: </ErrorResponse>
2017/02/08 13:40:47 [DEBUG] plugin: terraform:
2017/02/08 13:40:47 [DEBUG] plugin: terraform: -----------------------------------------------------
```
Error returns now, as expected:
```
Error applying plan:
2017/02/08 13:40:47 [DEBUG] plugin: waiting for all plugin processes to complete...
1 error(s) occurred:
* aws_rds_cluster.jake (destroy): 1 error(s) occurred:
2017/02/08 13:40:47 [DEBUG] plugin: terraform: aws-provider (internal) 2017/02/08 13:40:47 [DEBUG] plugin: waiting for all plugin processes to complete...
* aws_rds_cluster.jake: RDS Cluster cannot be deleted: Cluster cannot be deleted, it still contains DB instances in non-deleting state.
```
message
Fixes: #11568
```
% make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSRDSCluster_missingUserNameCausesError'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/02/01 12:11:14 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSRDSCluster_missingUserNameCausesError -timeout 120m
=== RUN TestAccAWSRDSCluster_missingUserNameCausesError
--- PASS: TestAccAWSRDSCluster_missingUserNameCausesError (3.22s)
PASS
ok github.com/hashicorp/terraform/builtin/providers/aws 3.243s
```
The error message for a required parameter being missing has a wrong parameter baked into it. Therefore, when the error message tried to fire, it was throwing a panic. Added a test to make sure that we know the condition still fires and with a correct message
The timeout was increased to 40 minutes when creating a new cluster in https://github.com/hashicorp/terraform/pull/8052. However when creating a cluster from a snapshot the timeout is still 15 minutes. I've increased this to 40 minutes.
* provider/aws: Support kms_key_id for `aws_rds_cluster`
```
% make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSRDSCluster_'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSRDSCluster_
-timeout 120m
=== RUN TestAccAWSRDSCluster_basic
--- PASS: TestAccAWSRDSCluster_basic (127.57s)
=== RUN TestAccAWSRDSCluster_kmsKey
--- PASS: TestAccAWSRDSCluster_kmsKey (323.72s)
=== RUN TestAccAWSRDSCluster_encrypted
--- PASS: TestAccAWSRDSCluster_encrypted (173.25s)
=== RUN TestAccAWSRDSCluster_backupsUpdate
--- PASS: TestAccAWSRDSCluster_backupsUpdate (264.07s)
PASS
ok github.com/hashicorp/terraform/builtin/providers/aws 888.638s
```
* provider/aws: Add KMS Key ID to `aws_rds_cluster_instance`
```
```
Jeff Theriault