Fix StackSet Update - Only update Parameters/AutoDeployment

[xiwhuang]

Issue #38

Description of changes:

• Fix StackSet Update - Update will be not triggered if only update Parameters/AutoDeployment

Testing

• [X] Manual test passed
  • Only update AutoDeployment
  • Only update Parameters
• [X] Integration test passed

Testing Template

Resources:
  TestStackSet:
    Type: AWS::CloudFormation::StackSet
    Properties:
      StackSetName: StackSet-UpdateTest
      Description: Description
      PermissionModel: SERVICE_MANAGED
      AutoDeployment:
        Enabled: true
        RetainStacksOnAccountRemoval: true
      Parameters:
        - ParameterKey: Number
          ParameterValue: 150
      TemplateBody: |
        Parameters:
          Number:
            Type: "String"
        Resources:
          WaitCondition: 
            Type: AWS::CloudFormation::WaitCondition
            Properties: 
              Timeout: !Ref Number
Outputs:
  StackSetId:
    Value: !Ref TestStackSet

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