provider/aws: Normalization of SPF records to prevent reporting changes

[stack72]

Adding support for the normalizing of Route53 SPF records. Fixes #3230

make testacc TEST=./builtin/providers/aws TESTARGS='-run=Route53Record_spfSupport' 2>~/tf.log
go generate ./...
TF_ACC=1 go test ./builtin/providers/aws -v -run=Route53Record_spfSupport -timeout 90m
=== RUN   TestAccAWSRoute53Record_spfSupport
--- PASS: TestAccAWSRoute53Record_spfSupport (79.17s)
PASS
ok      github.com/hashicorp/terraform/builtin/providers/aws    79.185s

[jen20]

👍 LGTM. Treating SPF records in the same way as TXT makes sense.

[ghost]

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