mardizzone/POS-1058: run devnets behind VPN and Bastillion

[marcello33]

Description

This PR changes the behaviour of express-cli and matic-cli to run devnets only behind Bastillion and VPN.
It also makes usage of DNS instead of public IPv4 addresses and creates a secret.tfvars file to store Bastillion and VPN IPs to avoid exposing them.
Default configurations for docker and remote setup have been adjusted accordingly.

Changes

• Bugfix (non-breaking change that solves an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)
• New test case for remote devnet

Breaking changes

Going forward, express-cli and matic-cli will only work behind Bastillion and VPN IPs, unless different configs are specified in secret.tfvars file.

Checklist

• I have added at least 2 reviewer or the whole pos-v1 team
• I have added sufficient documentation in code
• I will be resolving comments - if any - by pushing each fix in a separate commit and linking the commit hash in the comment reply

Testing

• I have tested this code manually on local environment
• I have tested this code manually on remote devnet using express-cli
• I have tested this code manually on mumbai

[cffls]

Will this change affect users, e.g. third party developers, who don't have vpn or bastions?

[marcello33]

They'd need to change the secret.tfvars and add their own IPs @cffls
That can be also set to 0.0.0.0/0 and traffic will be open as it used to be before this PR