Sync pip-requires with OpenStack Havana release (trivial)

Update the pip-requires to reflect the latest version in nova
Havana release.

Change-Id: I035b8a243c232de568a60d00b9a8050a966579a8
Merge "Sync pip-requires with OpenStack Havana release (trivial)" into havana/1.4
Merge branch 'havana/1.4' into havana/1.5

Change-Id: I55c4d15373fffcaf46dea8f1c2e004a6645d2438