Pin python zipp library

Zipp just added a hard check for py36. This pins zipp to a version
that still works with py35.

Issue-ID: CIMAN-33
Change-Id: I01d20fb9cf7a5de6a4f78750b3ee71116dd674bb
Signed-off-by: Anil Belur <abelur@linuxfoundation.org>
1 file changed