More horizon changes

This commit does the following:

- changes /static alias and COMPRESS_ROOT to
  {{ install_lib_dir }}/static/ (since this is where collectstatic
  writes to)
- removes bundled manage.py and copies it out from {{ git_dest }}
- runs horizon-manage.py compress --force as per Issue #108 fixed in
  stable/icehouse
- removes some symlinks we drop in v9.0.0 since having those in place
  cause horizon-manage.py collectstatic to fail
- remove chown of {{ install_lib_dir }}/openstack_dashboard and
  {{ install_lib_dir }}/horizon since Apache should only be writing to
  {{ install_lib_dir }}/static/