title: AWS Cloudformation userdata issue
body: <p>I am facing issue while launching cloudformation template passing userdata. Seems like no commands are running inside. Instance is coming up healthy without running these commands. Please help to resolve.</p>
  
  <pre><code>AWSTemplateFormatVersion : 2010-09-09
  Description: sonar
  Resources:
    Ec2Instance:
      Type: AWS::EC2::Instance 
      Properties:
        KeyName: sivakey_feb
        ImageId: ami-04bfee437f38a691e
        UserData:
          Fn::Base64: 
            !Sub |
              #!/bin/bash -xe
              sudo chown -R ec2-user:ec2-user /opt/sonar/temp/conf
              /opt/sonar/bin/linux-x86-64/sonar.sh start
        InstanceType: t2.large
        Tags:
          -
            Key: Name
            Value: sonar
  </code></pre>