juju/juju — pull request #813 by axw (2014-09-23 04:06:33+00:00)
Title: Add apt_preferences file with bootcmd

The apt_preferences file must be written
before we run "apt-get upgrade", or the
pinning does not take effect on non-bootstrap
machines.

Fixes https://bugs.launchpad.net/juju-core/+bug/1370781