Fix container list logics

Fix container list logics

The previous logic is buggy (e.g. vnfs are executed if arm64 [1])
Vnf images have been hugely reduced that allows testing them in
virtual deployments (see functest-virtual [2])

[1] https://build.opnfv.org/ci/view/functest%20(Installer%20gates)/job/functest-fuel-baremetal-daily-master/lastFailedBuild/console
[2] https://build.opnfv.org/ci/view/functest/job/functest-latest-daily/76/

Change-Id: Iec26708b66cbf3fe92849425f2afdf39a89d4bbe
Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>