Consider cgroup v2 when checking memory usage
Consider cgroup v2 when checking memory usage

The tests will now check the memory usage file in the location defined
for cgroup v2 and fallback to v1 in case of an error.

Signed-off-by: Vasiliy Ulyanov <874333a19fcb57a423921069a9d8e451d537235a@suse.de>

kubevirt/kubevirt,stu-gott/kubevirt,stu-gott/kubevirt,davidvossel/kubevirt,stu-gott/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,davidvossel/kubevirt,kubevirt/kubevirt,davidvossel/kubevirt,davidvossel/kubevirt,stu-gott/kubevirt