lxc: Don't delete the base container if it already exists.

Currently if the base container exists and we don't pass in
force-delete, it will automatically delete the base container.

BUG=None
TEST=panther_moblab build. Reboot's no longer delete the base
container.

Change-Id: I764ccd51df826b5e66fa79cfa06bccbccca8815d
Reviewed-on: https://chromium-review.googlesource.com/263650
Trybot-Ready: Simran Basi <sbasi@chromium.org>
Tested-by: Simran Basi <sbasi@chromium.org>
Reviewed-by: Dan Shi <dshi@chromium.org>
Commit-Queue: Simran Basi <sbasi@chromium.org>
1 file changed