Changes needed to use crossbuilder on manjaro

- If no 'dpkg' command found, try to determine host architecture using
  other metod(s).
- Don't check for 'dpkg-architecture' command at beginning. Run the
  command in container, if missing.
- Don't check for 'dpkg-parsechangelog' command at beginning. Run the
  command in container or replace it by using grep+sed, if missing.
- Run lxd daemon at startup, if not running.
- Use current user/group id in lxd subuid/subgid setup & assurance.
- If not 'apt' found, check for 'pacman' and use if present.
- If container is missing network access, try to apply 'dhclient' hack.
  and then check again for network.