[Bug 1519677] [NEW] add lxd backend

[Martin Pitt]

Public bug reported:

LXD is the direction that the LXC project is moving towards, and it has
several nice features that are helpful for autopkgtest: fast container
creation with intelligent caching, support for local images (with
autopkgtest modifications), and seamless support for remote containers.

We need the latter for moving armhf testing into Scalingstack, as we
don't have native armhf support there. We can create a big semi-
permanent arm64 instance and then create armhf lxd containers  in that,
and talk to them from the autopkgtest controller node in ProdStack using
the arm64 instance as a remote. This cannot be done with either the ssh
runner (that would need some rather complicated setup script) nor the
lxc runner (I tried wrapping ssh around it, but the extra level of shell
processing/quoting breaks stuff).

** Affects: autopkgtest (Ubuntu)
     Importance: Wishlist
     Assignee: Martin Pitt (pitti)
         Status: Triaged

** Changed in: autopkgtest (Ubuntu)
       Status: New => Triaged

** Changed in: autopkgtest (Ubuntu)
   Importance: Undecided => Wishlist

** Changed in: autopkgtest (Ubuntu)
     Assignee: (unassigned) => Martin Pitt (pitti)

** Changed in: autopkgtest (Ubuntu)
    Milestone: None => ubuntu-15.12

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https://bugs.launchpad.net/bugs/1519677

Title:
  add lxd backend

Status in autopkgtest package in Ubuntu:
  Triaged

Bug description:
  LXD is the direction that the LXC project is moving towards, and it
  has several nice features that are helpful for autopkgtest: fast
  container creation with intelligent caching, support for local images
  (with autopkgtest modifications), and seamless support for remote
  containers.

  We need the latter for moving armhf testing into Scalingstack, as we
  don't have native armhf support there. We can create a big semi-
  permanent arm64 instance and then create armhf lxd containers  in
  that, and talk to them from the autopkgtest controller node in
  ProdStack using the arm64 instance as a remote. This cannot be done
  with either the ssh runner (that would need some rather complicated
  setup script) nor the lxc runner (I tried wrapping ssh around it, but
  the extra level of shell processing/quoting breaks stuff).

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