Cleanup the source distribution.

Cleanup the source distribution.

Missing text files such as LICENSE and various READMEs are now
included in the tarball source distribution. The Makefile and shell
script for installing the openvswitch agent on xen are also now
included. The openvswitch and linuxbridge agents are included, and
executable wrapper scripts for the agents are provided. The cisco and
linuxbridge nova drivers are now setup to be run from the quantum
namespace rather than copied to nova. Finally, the setup_*.py scripts
have been removed from the project. Fixes bug 925074.

Test by running "python setup.py sdist" and examining the generated
tarball.

Change-Id: I33d336a5eb13678e6d527b575958393b337b6f3d
Signed-off-by: Bob Kukura <rkukura@redhat.com>