Use pip -e in setup_develop

Change-Id: I9d16427b25e24429d447c81a2d7a66227c2658e1
add oslo and infra from git to the upgrade

to make grenade work like havana master we need to bring in infra
and oslo repositories from upstream git and apply global
requirements to all the repositories.

Update functions file from devstack

Change-Id: I310d40a0adc9355eea91e79598bf867ad6818b79