This change switches to using isCgroup2UnifiedMode locally to ensure
that any mocked function is also used when checking the swap controller
availability.

Signed-off-by: Evan Lezar <elezar@nvidia.com>

This change bypasses all logic to set swap in the linux container
resources if a swap controller is not available on node. Failing
to do so may cause errors in runc when starting a container with
a swap configuration -- even if this is set to 0.

Signed-off-by: Evan Lezar <elezar@nvidia.com>