Remove aws_cognito_user_pool_domain_invalid_domain rule (#158)

Author: wata727

docs/rules/README.md

@@ -231,7 +231,6 @@ These rules enforce best practices and naming conventions:
 |aws_cognito_user_pool_client_invalid_name|✔|
 |aws_cognito_user_pool_client_invalid_user_pool_id|✔|
 |aws_cognito_user_pool_domain_invalid_certificate_arn|✔|
-|aws_cognito_user_pool_domain_invalid_domain|✔|
 |aws_cognito_user_pool_domain_invalid_user_pool_id|✔|
 |aws_cognito_user_pool_invalid_email_verification_message|✔|
 |aws_cognito_user_pool_invalid_email_verification_subject|✔|

rules/models/aws_cognito_user_pool_domain_invalid_domain.go

@@ -38,7 +38,7 @@ mapping "aws_cognito_user_pool_client" {
 }
 
 mapping "aws_cognito_user_pool_domain" {
-  domain          = DomainType
+  domain          = any // DomainType is not appropriate for a fully-customized domain. See also https://github.com/terraform-linters/tflint-ruleset-aws/issues/156
   user_pool_id    = UserPoolIdType
   certificate_arn = ArnType
 }
@@ -112,8 +112,3 @@ test "aws_cognito_user_pool_client" "name" {
   ok = "client"
   ng = "client/example"
 }
-
-test "aws_cognito_user_pool_domain" "domain" {
-  ok = "auth"
-  ng = "auth example"
-}

rules/models/aws_cognito_user_pool_domain_invalid_domain_test.go

@@ -170,7 +170,6 @@ var Rules = []tflint.Rule{
 	NewAwsCognitoUserPoolClientInvalidNameRule(),
 	NewAwsCognitoUserPoolClientInvalidUserPoolIDRule(),
 	NewAwsCognitoUserPoolDomainInvalidCertificateArnRule(),
-	NewAwsCognitoUserPoolDomainInvalidDomainRule(),
 	NewAwsCognitoUserPoolDomainInvalidUserPoolIDRule(),
 	NewAwsCognitoUserPoolInvalidEmailVerificationMessageRule(),
 	NewAwsCognitoUserPoolInvalidEmailVerificationSubjectRule(),