Place an accurate lower bound on pbr

Without this version, markers will fail to install in a growing number
of projects.

Change global-requirements to prevent
pip -r requirements.txt; pip install .
failing with an already installed and too old for setup_requires pbr.

Change update.py to signal to setuptools the minimum version required,
giving clearer error messages in the case of downgrades during
devstack.

Change-Id: I074274b470a7a4f2c95211677b135038ab2c942c

global-requirements.txt

@@ -102,7 +102,7 @@ Parsley
 passlib
 Paste
 PasteDeploy>=1.5.0
-pbr>=0.11,<2.0
+pbr>=1.3,<2.0
 pecan>=0.8.0
 pexpect>=3.1,!=3.3 # ISC License
 Pillow>=2.4.0 # MIT

openstack_requirements/cmds/update.py

@@ -62,7 +62,7 @@ except ImportError:
     pass
 
 setuptools.setup(
-    setup_requires=['pbr'],
+    setup_requires=['pbr>=1.3'],
     pbr=True)
 """
 

setup.py

@@ -25,5 +25,5 @@ except ImportError:
     pass
 
 setuptools.setup(
-    setup_requires=['pbr'],
+    setup_requires=['pbr>=1.3'],
     pbr=True)

upper-constraints.txt

@@ -196,7 +196,7 @@ packaging===15.2
 paramiko===1.15.2
 passlib===1.6.2
 pathlib===1.0.1;python_version=='2.7'
-pbr===1.2.0
+pbr===1.3.0
 pecan===0.9.0
 pexpect===3.2
 ply===3.6