As noticed in the acceptance tests, we were expecting the document to be
deleted but it was still found
```
=== RUN TestAccAWSSSMDocument_permission
--- FAIL: TestAccAWSSSMDocument_permission (5.60s)
testing.go:329: Error destroying resource! WARNING: Dangling
resources
may exist. The full state and error is shown below.
Error: Check failed: Expected AWS SSM
Document to be gone, but was still found
State: <no state>
```
* provider/aws: Add errcheck to Makefile, error on unchecked errors
* more exceptions
* updates for errcheck to pass
* reformat and spilt out the ignore statements
* narrow down ignores
* fix typo, only ignore Close and Write, instead of close or write
* provider/aws: add `aws_ssm_document` resource
* provider/aws: Changes to `aws_ssm_document` post code review
The changes are things like using d.Id rather than d.Get("name").(string)
and errwrap.Wrapf rather than fmt.Errorf
Liam Bennett