print topology for NVMe nodes in kernel and path

print topology for NVMe nodes in kernel and path

This patch enables listing kernel devices (under /dev/ or sysfs)
and the ones available under passed path in a single call.

The additional path parameter is optional and first kernel
device topology is checked. After that legacy_list is called
on that and topologies are joint together.

Signed-off-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>