fix call of ImageCommands, object should not be called, only class should be
  remove loopback_file reference, not existing anymore
  filesystem not available anymore, and depends on volume layout so remove the
  execute commands after the user_packages install, else user won't be able to
  call or update installed packages
Merge remote-tracking branch 'osallou/update_image_commands_to_base' into python

Conflicts:
	plugins/image_commands/__init__.py
	plugins/image_commands/image_commands.py
Rename image_commands task module to "tasks"