Backport of client: do not disable memory swappiness if kernel does not support it into release/1.5.x #17672
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Backport
This PR is auto-generated from #17625 to be assessed for backporting due to the inclusion of the label backport/1.5.x.
The below text is copied from the body of the original PR.
This PR adds a workaround for very old Linux kernels which do not support
the memory swappiness interface file. Normally we write a "0" to the file
to explicitly disable swap. In the case the kernel does not support it,
give libcontainer a nil value so it does not write anything.
Fixes #17448