provider/aws: Add ability to 'terraform import' aws_kms_alias resources

[ewbankkit]

Enable terraform import of KMS aliases using the name attribute.
Acceptance tests:

make testacc TEST=./builtin/providers/aws/ TESTARGS='-run=TestAccAWSKmsAlias_import'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/05/19 14:32:25 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws/ -v -run=TestAccAWSKmsAlias_import -timeout 120m
=== RUN   TestAccAWSKmsAlias_importBasic
--- PASS: TestAccAWSKmsAlias_importBasic (44.72s)
PASS
ok  	github.com/hashicorp/terraform/builtin/providers/aws	44.735s

[grubernaut]

LGTM, thanks!

[ghost]

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