Add support for importing load with import.sh from the current load.
This enables to always import load with higher version import.sh (in the
case of load-import --inactive)
TCs:
passed: from system controller running 23.09 load, import 22.12 load
passed: regression import N+1 load
Story: 2010611
Task: 48371
Change-Id: I4aec6eaa89019d4852979c27a708e409f32e27b0
Signed-off-by: Bin Qian <bin.qian@windriver.com>