Remove left over python 2 specifc code

[jeffj6123]

When reporting a new issue include the following information:

• sfctl version, can check this using pip show sfctl
• Service Fabric cluster runtime version
• Service Fabric hosting location (on-premise or Azure usually)
• Debug log if an error is present (can be captured using --debug flag)

Be sure to check if an issue already exists with your symptoms. If so, leave a :thumbsup: reaction to the original issue, rather than creating a duplicate.