Re-add setuptools-git to setup.py
Re-add setuptools-git to setup.py

In 02f59a0768a56c084fa72ac9c1e47f1a819baadc we removed:

  setup_requires=['setuptools-git>=0.4'],

from setup.py file and it broke tarball generation in that some files
are now missing.

Change-Id: I53997b68a4a36cae63d191d63bc19ef459c228c4
Fixes: bug #1169295

mapr/sahara,bigfootproject/sahara,esikachev/sahara-backup,xme1226/sahara,keedio/sahara,zhangjunli177/sahara,redhat-openstack/sahara,citrix-openstack-build/sahara,crobby/sahara,crobby/sahara,mapr/sahara,matips/iosr-2015,matips/iosr-2015,bigfootproject/sahara,openstack/sahara,citrix-openstack-build/sahara,henaras/sahara,zhangjunli177/sahara,xme1226/sahara,tellesnobrega/sahara,zhujzhuo/Sahara,esikachev/scenario,egafford/sahara,rnirmal/savanna,ekasitk/sahara,matips/iosr-2015,redhat-openstack/sahara,tellesnobrega/storm_plugin,ekasitk/sahara,xme1226/sahara,bigfootproject/sahara,tellesnobrega/storm_plugin,mapr/sahara,esikachev/sahara-backup,tellesnobrega/storm_plugin,crobby/sahara,henaras/sahara,redhat-openstack/sahara,esikachev/scenario,ekasitk/sahara,esikachev/scenario,keedio/sahara,zhujzhuo/Sahara,tellesnobrega/sahara,esikachev/sahara-backup,egafford/sahara,henaras/sahara,citrix-openstack-build/sahara,zhujzhuo/Sahara,rnirmal/savanna,openstack/sahara,zhangjunli177/sahara,keedio/sahara