Update C++ server scripts/batch files

[wing328]

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, 3.1.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

#250 follow up

[wing328]

cc @ravinikam @stkrwork @fvarose @etherealjoy @MartinDelille

[MartinDelille]

This Circle CI/Shippable thing is slowing down our validation process.

[wing328]

For CircleCI, moving to CircleCI 2.0 infra may improve the run time of the build.

For Shippable, no obvious solution off the to top of my head at the moment (well it's free and we appreciate shippable providing CI to us at no cost)