Include the iotop package on Debian ISO
Useful for debugging performance issues.
Test Plan
PASS Build ISO
PASS Login with sysadmin user
PASS Run the command "iotop"
Closes-Bug: 2032846
Depends-On: https://review.opendev.org/c/starlingx/tools/+/892400
Change-Id: I26c4a2618f071f351c1e13726503b78c1b2d94e6
Signed-off-by: Cesar Pompeu de Barros Bombonate <Cesar.PompeudeBarrosBombonate@windriver.com>