The volume_Droplet test was failing from an incorrect fix pushed on Friday. Fixes the failing test.
```
$ make testacc TEST=./builtin/providers/digitalocean TESTARGS='-run=TestAccDigitalOceanVolume_Droplet'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/02/11 17:55:09 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/digitalocean -v -run=TestAccDigitalOceanVolume_Droplet -timeout 120m
=== RUN TestAccDigitalOceanVolume_Droplet
--- PASS: TestAccDigitalOceanVolume_Droplet (52.78s)
PASS
ok github.com/hashicorp/terraform/builtin/providers/digitalocean 52.797s
```
A security_group_rule can also be created from a `prefix_list_id`.
Introduced in #11809
```
$ make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSSecurityGroupRule_PrefixListEgress'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/02/10 12:41:40 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSSecurityGroupRule_PrefixListEgress -timeout 120m
=== RUN TestAccAWSSecurityGroupRule_PrefixListEgress
--- PASS: TestAccAWSSecurityGroupRule_PrefixListEgress (33.94s)
PASS
ok github.com/hashicorp/terraform/builtin/providers/aws 33.970s
```
These are skipped without the SSH_UPLOAD_TEST flag, since they require
connecting to a running ssh server on localhost as the current user, and
one creates a very large file.
* provider/aws: output the log group name when create fails
* adjusted formatting to match other error output
* fixup detailed error message for ResourceAlreadyExistsException
* forgot an import
* show the log group name regardless of error type
Previously the AMI creation accepted a static value for the AMI's block device's volume size.
This change allows the user to omit the `volume_size` attribute, in order to mimic the AWS API behavior, which will use the EBS Volume's size.
Also fixes a potential panic case when setting `iops` on the AMI's block device.
The `aws_ami` resource previously didn't have any acceptance tests, adds two acceptance tests and a full testing suite for the `aws_ami` resource, so further tests can be written, as well as expansion upon the other `aws_ami_*` acceptance tests
```
$ make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSAMI_'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/02/09 20:18:22 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSAMI_ -timeout 120m
=== RUN TestAccAWSAMI_basic
--- PASS: TestAccAWSAMI_basic (44.21s)
=== RUN TestAccAWSAMI_snapshotSize
--- PASS: TestAccAWSAMI_snapshotSize (45.08s)
PASS
ok github.com/hashicorp/terraform/builtin/providers/aws 89.320s
```
During backend initialization, especially during a migration, there is a
chance that an existing state could be overwritten.
Attempt to get a locks when writing the new state. It would be nice to
always have a lock when reading the states, but the recursive structure
of the Meta.Backend config functions makes that quite complex.
* Enable remote s3 state support for assume role
- provide role_arn in backend config to enable assume role
Fixes#8739
* Check for errors after obtaining credentials
Allows redshift security group tests to better handle being ran in parallel.
```
$ make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSRedshiftSecurityGroup_'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/02/09 10:40:25 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSRedshiftSecurityGroup_ -timeout 120m
=== RUN TestAccAWSRedshiftSecurityGroup_importBasic
--- PASS: TestAccAWSRedshiftSecurityGroup_importBasic (12.98s)
=== RUN TestAccAWSRedshiftSecurityGroup_ingressCidr
--- PASS: TestAccAWSRedshiftSecurityGroup_ingressCidr (11.02s)
=== RUN TestAccAWSRedshiftSecurityGroup_updateIngressCidr
--- PASS: TestAccAWSRedshiftSecurityGroup_updateIngressCidr (32.81s)
=== RUN TestAccAWSRedshiftSecurityGroup_ingressSecurityGroup
--- PASS: TestAccAWSRedshiftSecurityGroup_ingressSecurityGroup (14.82s)
=== RUN TestAccAWSRedshiftSecurityGroup_updateIngressSecurityGroup
--- PASS: TestAccAWSRedshiftSecurityGroup_updateIngressSecurityGroup (37.43s)
PASS
ok github.com/hashicorp/terraform/builtin/providers/aws 109.090s
```
Allows the redshift parameter group acceptance tests handle being ran in parallel better
```
$ make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSRedshiftParameterGroup_'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/02/09 10:16:19 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSRedshiftParameterGroup_ -timeout 120m
=== RUN TestAccAWSRedshiftParameterGroup_importBasic
--- PASS: TestAccAWSRedshiftParameterGroup_importBasic (15.17s)
=== RUN TestAccAWSRedshiftParameterGroup_withParameters
--- PASS: TestAccAWSRedshiftParameterGroup_withParameters (13.16s)
=== RUN TestAccAWSRedshiftParameterGroup_withoutParameters
--- PASS: TestAccAWSRedshiftParameterGroup_withoutParameters (12.58s)
PASS
ok github.com/hashicorp/terraform/builtin/providers/aws 40.940s
```
Jake Champlin