Do not clean all containers in stop

[jonakarl]

Today container-stop clean all containers, this should only clean "itself" and maybe during sync.

[jonakarl]

Removed duplicate code in 3a62457

Cleanup is already done in

monroe-experiment-core/core/usr/bin/pull-base-containers

Line 18 in b4d84fe

for CONTAINER in $(docker ps -aq); do

Question if

monroe-experiment-core/core/usr/bin/pull-base-containers

Line 18 in b4d84fe

for CONTAINER in $(docker ps -aq); do

should be moved to sync ?