Multiple build improvements

- Removed `empty_config` option. The config should be now always empty because Cloud-init adds required parts dynamically at the first boot.
- Added ability to include any additional packages to the image, from list or deb files.
- Moved common resources for multiple tasks from tasks folder to `files` and `templates` on the root folder.
- Make `trim` actually works. Before this, it actually was a no-op, because RAW image mounted without the `discard` option cannot be trimmed. This significantly reduced the size of images with any additional packages inside, for example with Cloud-init.
- Fixed APT repository paths, according to the new structure of `dev.packages.vyos.net`.
- Added proper build repository for VyOS 1.3. It used the wrong `current` repo when should be `equuleus` now.
- Removed unused `boot/grub/device.map.j2` template.
- Deleted a secondary console option from the `grub.cfg.j2` template. According to testing an active console is only the latest listed, so it seems that there is no sense to keep there two items.

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