Manually create ARM deb package with Mender client

Acceptance criteria:

• Deb package containing:
  • Client
  • /etc/mender/mender.conf with production settings
  • /etc/mender/mender.conf.production with production settings
  • /etc/mender/mender.conf.demo with demo settings
  • deb update module (rpm obviously not needed, as this is itself a deb package)
  • file-install update module
  • shell-command update module
  • Docker update module
• Must depend on needed libraries:
  • liblzma
  • Must not depend on Docker (too hard requirement)
• Manually tested each of the update modules on RPi