armv7hl-lge-hammerhead: Add maui user to sudoers

I know this is bad because we add maui to the sudoers without password
but it's handy for development.

As soon as we can switch to developer mode from a UI just like Jolla does
we want to get rid of it.
armv7hl-lge-hammerhead: Unmask sshd-keys.service

Otherwise sshd service won't start automatically.

This is a change I don't like to do, when a proper developer mode is in
place we will be able to have sshd started when needed.
armv7hl-lge-hammerhead: Add a few comments to services post script
Improve services configuration

By default systemd networking is disabled for all adaptations and avahi
is enabled only when it does matter.
Update documentation
armv7hl-lge-hammerhead: Fix sudoers file permission
armv7hl-lge-hammerhead: More tweaks to services
armv7hl-lge-hammerhead: Use our init-debug