[autotest] Add autoserv's pid to the container's name

The PID info will be used to determine if a container is orphaned.

BUG=chromium:479383
TEST=sudo python  site_utils/lxc_functional_test.py
local run a server side test

Change-Id: I4de2f7f266bcb793cfe1a97e412868aa49d53991
Reviewed-on: https://chromium-review.googlesource.com/266754
Tested-by: Dan Shi <dshi@chromium.org>
Reviewed-by: Simran Basi <sbasi@chromium.org>
Commit-Queue: Dan Shi <dshi@chromium.org>
3 files changed