Add netplan-based network topology encoding

[abeltrano]

Type

• Bug fix
• Feature addition
• Feature update
• Documentation
• Build Infrastructure

Side Effects

• Breaking change
• Non-functional change

Goals

• Automate as much of the required system network configuration as possible.

Technical Details

• Add configuration for netplan, a network configuration abstraction renderer from Canonical.
  • Add cloud config file 99-disable-network-config.cfg to disable netplan-based cloud network init.
  • Add netplan file 10-network-netremote-all.yaml defining topology for bridging ethernet to wireless clients.
• Consolidate debug and release hostapd@ systemd service unit template files.
• Update hostapd-genconfig@ systemd service unit template:
  • To only run when the target hostapd configuration file doesn't already exist.
  • To remove commented lines from the generated configuration file.
• Update template hostapd configuration file to only enable WPA3 personal (SAE) and include a default bridge configuration consistent with that generated by the netplan.

Test Results

• Cleaned test system of all installed files, re-built .deb packages, re-installed them, and verified all desired configuration was as expected.

Reviewer Focus

• None

Future Work

• Documentation for using the netplan files needs to be added, specifically, where the files need to be copied and how to generate and apply the configuration files for/from the netplan.

Checklist

• Build target all compiles cleanly.
• clang-format and clang-tidy deltas produced no new output.
• Newly added functions include doxygen-style comment block.