Add teardown, pullall, and a fix

1. Add a teardown script
2. Add a pullall image script
3. Run docker exec as detached for loading CM pugins

Issue-ID: DCAEGEN2-434
Change-Id: I198e32819af14f182a3435c0f3c5d82e391ae448
Signed-off-by: Lusheng Ji <lji@research.att.com>
3 files changed