Do not support dimensions:kernel_memory on Docker API 1.42

It is deprecated in 20.10 and removed in 23.0 (and 23.0 is out) [1], [2].

[1]: https://docs.docker.com/engine/deprecated/#kernel-memory-limit
[2]: https://docs.docker.com/engine/api/version-history/#v142-api-changes

Change-Id: Ia6fa85172aad7bcd5f958922d3c224ef79882e6c