provider/aws: Add support for CloudTrail tags

[radeksimko]

Acceptance tests

$ make testacc TEST=./builtin/providers/aws TESTARGS='-run=AWSCloudtrail'

[stack72]

@radeksimko this looks good! I had to run a different command for the tests:

$ make testacc TEST=./builtin/providers/aws TESTARGS='-run=AWSCloudTrail'

But got the following results:

ake testacc TEST=./builtin/providers/aws TESTARGS='-run=AWSCloudTrail'
==> Checking that code complies with gofmt requirements...
/Users/stacko/Code/go/bin/stringer
GO15VENDOREXPERIMENT=1 go generate $(GO15VENDOREXPERIMENT=1 go list ./... | grep -v /vendor/)
TF_ACC=1 GO15VENDOREXPERIMENT=1 go test ./builtin/providers/aws -v -run=AWSCloudTrail -timeout 120m
=== RUN   TestAccAWSCloudTrail_basic
--- PASS: TestAccAWSCloudTrail_basic (41.89s)
=== RUN   TestAccAWSCloudTrail_enable_logging
--- PASS: TestAccAWSCloudTrail_enable_logging (55.87s)
=== RUN   TestAccAWSCloudTrail_is_multi_region
--- PASS: TestAccAWSCloudTrail_is_multi_region (54.72s)
=== RUN   TestAccAWSCloudTrail_logValidation
--- PASS: TestAccAWSCloudTrail_logValidation (43.55s)
=== RUN   TestAccAWSCloudTrail_tags
--- PASS: TestAccAWSCloudTrail_tags (60.03s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    256.080s

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