Fix for Bug 1174 zombie processes. Replaced multiprocessing with concurrent-futures

Change-Id: I105973aa944fc23a45a50de14bb6d7106a0037fb
Signed-off-by: palsus <subhankar.pal@aricent.com>
(cherry picked from commit 9a773323e8cec18fb0f2fa204b0cea4e2370c5dd)
4 files changed