Update single install package dependencies
Wait for bootstrap lxc to be RUNNING

If we just run `juju status', the machine can't be resolved and juju status
exits immediately, so we lxc-wait for it, so that juju status will just get a
connection refused, and block until it comes up.
Change bootstrap wait
Add a MAAS_IMAGES_PROXY env variable
Revert "Wait for bootstrap lxc to be RUNNING"

This reverts commit ac1f55aa2d4ec3fe14c66eb8d5b2f2a42ecd4186.
Merge github.com:Ubuntu-Solutions-Engineering/cloud-installer into develop