VFIO tests are unstable

[Bolodya1997]

Failure logs

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x168fa60]

goroutine 52 [running]:
github.com/networkservicemesh/sdk-sriov/pkg/tools/cgroup.(*device).isWiderThan(0xc00010e0c0, 0x0, 0x17698e0)
	/Users/runner/work/sdk-sriov/sdk-sriov/pkg/tools/cgroup/device.go:95 +0x60
github.com/networkservicemesh/sdk-sriov/pkg/tools/cgroup.(*fakeCgroupDevices).allow(0xc00000e840, 0x0)
	/Users/runner/work/sdk-sriov/sdk-sriov/pkg/tools/cgroup/fake_cgroup.go:138 +0x114
github.com/networkservicemesh/sdk-sriov/pkg/tools/cgroup.newFakeCgroup.func2(0x0, 0x0)
	/Users/runner/work/sdk-sriov/sdk-sriov/pkg/tools/cgroup/fake_cgroup.go:92 +0xea
github.com/networkservicemesh/sdk-sriov/pkg/tools/cgroup.inputFileAPI.func1(0xc000010178, 0x18c8308, 0xc00006f2c0, 0xc000064800)
	/Users/runner/work/sdk-sriov/sdk-sriov/pkg/tools/cgroup/file_api.go:54 +0xdf
created by github.com/networkservicemesh/sdk-sriov/pkg/tools/cgroup.inputFileAPI
	/Users/runner/work/sdk-sriov/sdk-sriov/pkg/tools/cgroup/file_api.go:47 +0x150
FAIL	github.com/networkservicemesh/sdk-sriov/pkg/networkservice/common/mechanisms/vfio	1.443s

https://github.com/networkservicemesh/sdk-sriov/pull/276/checks?check_run_id=3744951908