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Make user/vendor data sensitive and remove log permissions (#2144)
Because user data and vendor data may contain sensitive information, this commit ensures that any user data or vendor data written to instance-data.json gets redacted and is only available to root user. Also, modify the permissions of cloud-init.log to be 640, so that sensitive data leaked to the log isn't world readable. Additionally, remove the logging of user data and vendor data to cloud-init.log from the Vultr datasource. LP: #2013967 CVE: CVE-2023-1786
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