scripts: add a ledctl wrapper script for NPEM

It is possible to use ledctl utility to control the state of LEDs in
systems supporting NPEM, even when the NVMe devices are controlled by
SPDK. However

scripts: add a ledctl wrapper script for NPEM

It is possible to use ledctl utility to control the state of LEDs in
systems supporting NPEM, even when the NVMe devices are controlled by
SPDK. However, in this case it is necessary to determine the slot device
number because the block device is unavailable. This script takes care
of that, based on nvme bdev name, and invokes ledctl with correct
parameters.

Change-Id: Ib92cd5ca27b8353a62917eed06e1b6ddf119cf49
Signed-off-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/16811
Reviewed-by: Konrad Sztyber <konrad.sztyber@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>

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