Fix aws_acm_certificate.private_key mapping and remove the rule (#576)

Author: wata727

docs/rules/README.md

@@ -92,7 +92,6 @@ These rules enforce best practices and naming conventions:
 |aws_acm_certificate_invalid_certificate_authority_arn|✔|
 |aws_acm_certificate_invalid_certificate_body|✔|
 |aws_acm_certificate_invalid_certificate_chain|✔|
-|aws_acm_certificate_invalid_private_key|✔|
 |aws_acm_certificate_validation_invalid_certificate_arn|✔|
 |aws_acmpca_certificate_authority_certificate_invalid_certificate_authority_arn|✔|
 |aws_acmpca_certificate_authority_invalid_type|✔|

rules/models/mappings/acm.hcl

@@ -4,7 +4,7 @@ mapping "aws_acm_certificate" {
   // domain_name            = DomainNameString
   subject_alternative_names = DomainList
   // validation_method      = ValidationMethod
-  private_key               = PrivateKey
+  private_key               = PrivateKeyBlob
   certificate_body          = CertificateBody
   certificate_chain         = CertificateChain
   certificate_authority_arn = PcaArn
@@ -18,4 +18,4 @@ mapping "aws_acm_certificate_validation" {
 test "aws_acm_certificate" "certificate_authority_arn" {
   ok = "arn:aws:acm-pca:us-east-1:0000000000:certificate-authority/xxxxxx-xxx-xxx-xxxx-xxxxxxxxx"
   ng = "arn:aws:unknown-service:us-east-1:0000000000:certificate-authority/xxxxxx-xxx-xxx-xxxx-xxxxxxxxx"
-}
+}

rules/models/provider.go

@@ -17,7 +17,6 @@ var Rules = []tflint.Rule{
 	NewAwsAcmCertificateInvalidCertificateAuthorityArnRule(),
 	NewAwsAcmCertificateInvalidCertificateBodyRule(),
 	NewAwsAcmCertificateInvalidCertificateChainRule(),
-	NewAwsAcmCertificateInvalidPrivateKeyRule(),
 	NewAwsAcmCertificateValidationInvalidCertificateArnRule(),
 	NewAwsAcmpcaCertificateAuthorityCertificateInvalidCertificateAuthorityArnRule(),
 	NewAwsAcmpcaCertificateAuthorityInvalidTypeRule(),