The usm_load_import script is currently being copied to two
different places needlessly during the upload process for a
major release: (/etc/software and /opt/software/rel-<ver>/bin).
This commit keeps only the copy to the versioned directory under
/opt/software/rel-<ver> and also changes the code to use the
script from this location accordingly.
Test Plan
PASS: run 'software upload' successfully
Story: 2010676
Task: 49624
Relates-to: https://review.opendev.org/c/starlingx/update/+/910027
Change-Id: I0178007721505ff8e2c2244964692b79e8aafea9
Signed-off-by: Heitor Matsui <heitorvieira.matsui@windriver.com>