Don't build docker containers if any exist

Skips dockerctl build all in puppet if any
docker containers (running or stopped) exist.

Change-Id: Idca4e43f2b714ae953a0755b69b215e9efc4c56a
Closes-Bug: #1333213
(cherry picked from commit 6abeeb7ae534e691f01311e2c84b694c167d4a69)