Removal of F824 (unnecessary use of nonlocal keyword) flake8 error and Revert...

Removal of F824 (unnecessary use of nonlocal keyword) flake8 error and Revert Pin flake8 version while flake issues are being fixed (8a995a25)

Change-Id: Ide548d6c6408863c09f31ea3a4e086f7305983bc
Signed-off-by: Anirudh Gupta <anirudh.gupta@hsc.com>
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>