go-server: Support additional properties as command line arguments

Created by: mapero

PR checklist

• Read the contribution guidelines.
• Ran the shell script under ./bin/ to update Petstore sample so that CIs can verify the change. (For instance, only need to run ./bin/{LANG}-petstore.sh and ./bin/security/{LANG}-petstore.sh if updating the {LANG} (e.g. php, ruby, python, etc) code generator or {LANG} client's mustache templates). Windows batch files can be found in .\bin\windows\.
• Filed the PR against the correct branch: master, 3.4.x, 4.0.x. Default: master.
• Copied the technical committee to review the pull request if your PR is targeting a particular programming language.

Description of the PR

With this Pull Requests additional properties are supported as command line arguments:

• packageVersion
• sourceFolder
• serverPort

Thanks.

@antihax (2017/11) @bvwells (2017/12) @grokify (2018/07) @kemokemo (2018/09)