Some experiments consume unusual amount of RAM and are not cleaned up properly

[denkv]

Some experiments consume too much RAM, compared with others: https://w3id.org/hobbit/experiments#1608306725630,1608306734009,1607958126755,1604685169129,1608052657254,1607953352777,1607953325657,1605089861961,1608038447931

On another run, the same setup yields normal RAM usage: https://w3id.org/hobbit/experiments#1607958126755,1609758770866

Looks like the same experiments also weren't cleaned up - system, evaluation and MQ containers were not removed.