Add support for configuring internal IP only in GCP
This MR adds a possibility to setup a GCP VM that have no external IP address but only internal one. This is useful when the VMs should be hidden and access Internet only through Cloud NAT.
The MR adds a new configuration field in the
[GCP] section -
UseInternalIPOnly which takes a boolean value. To use internal-only IPs, one need to add this to the configuration:
(...) [GCP] (...) UseInternalIPOnly = true (...)