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TNSS-7607]
Modified set_perm to requirements as directed by security team regarding script write permissions and archive read permissions.
set_perm now interacts with scripts so etc_systemd_services.Linux_el8 was modified so set-perm precedes service scripts in the systemd service start ordering.
added tsu_includes/shell_scripts/
TNSS-7607.sh to unpack etc_systemd_services.Linux_el8