provider/aws: Add support for Lightsail Static IP Attachment

[radeksimko]

Test plan

make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSLightsailStaticIpAttachment'
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/03/30 15:04:32 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSLightsailStaticIpAttachment -timeout 120m
=== RUN   TestAccAWSLightsailStaticIpAttachment_basic
--- PASS: TestAccAWSLightsailStaticIpAttachment_basic (84.95s)
=== RUN   TestAccAWSLightsailStaticIpAttachment_disappears
--- PASS: TestAccAWSLightsailStaticIpAttachment_disappears (62.38s)
PASS
ok  	github.com/hashicorp/terraform/builtin/providers/aws	147.366s

[grubernaut]

LGTM!

[ghost]

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