Make lxd.conf used extendable/customisable

[Anastasia]

From https://github.com/juju/juju/issues/1112:

There are some situations where being able to modify the lxd config used to set up the containers for the local provider could be very handy; please consider providing some way of so doing.

The specific case I'm looking at is the Juju Vagrant images where we want all containers to have an APT proxy set up. The cleanest way to do this would be using lxc hooks to run a script which injects the cache, but we can't do that. As a result, we have to muck around with the templates, which is error-prone, brittle and adds to start-up time (as we have to have all the templates that we want to modify in-place at boot time, meaning we have to download all templates that there might be images for).

[james beedy (jamesbeedy)]

This should partially Fix Bug #1535891

[Anastasia (anastasia-macmood)]

Removing 2.1 milestone as we will not be addressing this issue in 2.1.

[Canonical Juju QA Bot (juju-qa-bot)]

This bug has not been updated in 5 years, so we're marking it Expired. If you believe this is incorrect, please update the status.