Escape slash and double quotes characters for password in setup.sh

[hlung]

Passwords may contain special characters that may break bash sed command (slashes) or json format (double quotes). This allow those kinds of password to be used safely.

PS. My bash skill is not strong so any advice is appreciated! :)

[mention-bot]

@hlung, thanks for your PR! By analyzing the annotation information on this pull request, we identified @simonsmh, @nivong and @rawgni to be potential reviewers

[solderzzc]

Thanks for the PR>