provider/aws: Add address, port, hosted_zone_id and endpoint for aws_db_instance datasource

[lucasvasconcelos]

• The address and hosted_zone_id can be used in a route53_record
• The port and the endpoint can be used to provide information when bootstrapping apps.

make testacc TEST=./builtin/providers/aws/ TESTARGS='-run=TestAccAWSDataDbInstance_endpoint'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/03/12 19:04:37 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws/ -v -run=TestAccAWSDataDbInstance_endpoint -timeout 120m
=== RUN   TestAccAWSDataDbInstance_endpoint
--- PASS: TestAccAWSDataDbInstance_endpoint (579.47s)
PASS
ok  	github.com/hashicorp/terraform/builtin/providers/aws	579.491s

[stack72]

LGTM thanks for this :)

[ghost]

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