Updates pbr requirements

Removes the version from setup.cfg and moves
Windows platdorm requirements to requirements-windows.txt

Closes-Bug: #1404746

Change-Id: Ieadc67e6c320e9712c57d6adf3f3e6df6ae78b75

requirements-windows.txt

@@ -0,0 +1,3 @@
+pywin32
+comtypes
+wmi

requirements.txt

@@ -1,4 +1,4 @@
-pbr>=0.5.22,!=0.5.23,<1.0
+pbr>=0.10
 iso8601
 eventlet
 netaddr>=0.7.6

setup.cfg

@@ -1,6 +1,5 @@
 [metadata]
 name = cloudbase-init
-version = 0.9.6
 summary = Portable cloud initialization service
 description-file =
   README.rst

setup.py

@@ -15,13 +15,7 @@
 #    under the License.
 
 import setuptools
-import sys
-
-if sys.platform == 'win32':
-    platform_requirements = ['pywin32', 'comtypes', 'wmi']
-else:
-    platform_requirements = []
 
 setuptools.setup(
-    setup_requires=['pbr>=0.5.22,!=0.5.23'] + platform_requirements,
+    setup_requires=['pbr>=0.10'],
     pbr=True)