argument and verb formatting fixes reported by go vet

builtin/providers/aws/tags_test.go:56: unrecognized printf verb 'i'
builtin/providers/aws/tags_test.go:59: unrecognized printf verb 'i'

config/config_test.go:101: possible formatting directive in Fatal call
config/config_test.go:157: possible formatting directive in Fatal call

config/module/get_file_test.go:91: missing argument for Fatalf(%s): format reads arg 1, have only 0 args

helper/schema/schema.go:341: arg v.Type for printf verb %s of wrong type: schema.ValueType
helper/schema/schema.go:656: missing argument for Errorf(%s): format reads arg 2, have only 1 args
helper/schema/schema.go:912: arg schema.Type for printf verb %s of wrong type: schema.ValueType

terraform/context.go:178: arg v.Type() for printf verb %s of wrong type: github.com/hashicorp/terraform/config.VariableType
terraform/context.go:486: arg c.Operation for printf verb %s of wrong type: terraform.walkOperation

terraform/diff_test.go:100: arg actual for printf verb %s of wrong type: terraform.DiffChangeType
terraform/diff_test.go:235: arg actual for printf verb %s of wrong type: terraform.DiffChangeType
Add tag support to AWS subnets
Added new aws_db_parameter_group resource for creating RDS DB Parameter Groups.
Added plumbing to allow an optional DBParameterGroupName to be passed when creating an RDS DB instance.
Added missing update support for new aws_db_parameter_group resource
Fixed incorrect ForcesNew settings for parameters and added better acceptance tests to ensure updates are working as expected
Fixed bug with final_snapshot_identifier and skip_final_snapshot and removed apply_method as an option for now and am only supporting immediate mode
Upped the RDS instance creation/destroy timeout to 20 minutes as it regularly takes 12+ minutes to create
Added an element interpolation lookup function for accessing a specific index from a list with splat variables
providers/aws: Route53 decrease MinTimeout interval

It get's a bit annoying when handling dozens of records to have the MinInterval for retries so high.
Merge pull request #563 from pmoust/patch-3

providers/aws: Route53 decrease MinTimeout interval
Refactoring the DNSimple provider

With this refactor the DNSimple provider is updated to use the
schema.Provider approach released with TF 0.2.
Refactoring the CloudFlare provider

With this refactor the CloudFlare provider is updated to use the
schema.Provider approach released with TF 0.2.
Removing obsolete struct tags
Removing obsolete struct tags
terraform: Simplify sub-graph finalization
Fix image links
Merge pull request #572 from hashicorp/sethvargo/images

Fix image links
Update version of middleman-hashicorp
Refactor the DigitalOcean provider

With this refactor the DigitalOcean provider is updated to use the
schema.Provider approach released with TF 0.2.
Updated the provider to make testing a little easier

Also makes the provider more inline with the others following the TF
0.2 approach.