hacking and flake8 have compatability issues.
By specifying the version of hacking to be the same
as what other openstack components are using, we
clamp the version of flake8 and allow for reliable
hacking checks.
Change-Id: I8ab1543c030439903d99fffec1a9e3a264f20a80
Story: 2004515
Task: 28571
Signed-off-by: Al Bailey <Al.Bailey@windriver.com>