r/elasticache_parameter_group: Retry resetting group on pending changes

[radeksimko]

This is to address the following test failure:

=== RUN   TestAccAWSElasticacheParameterGroup_removeParam
--- FAIL: TestAccAWSElasticacheParameterGroup_removeParam (8.71s)
    testing.go:434: Step 1 error: Error applying: 1 error(s) occurred:
        
        * aws_elasticache_parameter_group.bar: 1 error(s) occurred:
        
        * aws_elasticache_parameter_group.bar: Error resetting Cache Parameter Group: InvalidCacheParameterGroupState: Cannot reset the parameter group because the parameter appendfsync has pending changes.
            status code: 400, request id: 32179f6e-a73a-11e7-85aa-c99861294b17

I picked an arbitrary value of 15 seconds to start with and we'll see if it needs raising based on test results and failures in the future.

Test results

TF_ACC=1 go test ./aws -v -run=TestAccAWSElasticacheParameterGroup_removeParam -timeout 120m
=== RUN   TestAccAWSElasticacheParameterGroup_removeParam
--- PASS: TestAccAWSElasticacheParameterGroup_removeParam (59.93s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	59.977s

[Ninir]

LGTM! 👍

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!