Update to latest pbr

This commit moves switches tempest from the d2to1 version of pbr and
move to the latest version of pbr. However, there is a bug with
build_spinx so it doesn't work with a doc version set so that section
is removed from the doc conf.py.

Change-Id: I4fe14eb2b2e81132f8fa99936a031176b38c437b
diff --git a/setup.py b/setup.py
index 59a0090..70c2b3f 100755
--- a/setup.py
+++ b/setup.py
@@ -14,8 +14,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+# THIS FILE IS MANAGED BY THE GLOBAL REQUIREMENTS REPO - DO NOT EDIT
 import setuptools
 
 setuptools.setup(
-    setup_requires=['d2to1', 'pbr'],
-    d2to1=True)
+    setup_requires=['pbr'],
+    pbr=True)