Correctly install setuptools-git in package or pip format.

In order to correctly build the openstack dependencies we need
to bring in setuptools-git, or the package builiding process
blows up. In order to do this we need to attempt to install the
rpm, or build the rpm from source and install that.

Change-Id: If4bd64a96f2edda4c4640ffe455e0d6db11e02c6