Unsort pbr and hacking in requirements files

Each of these wants to come first. Python does not have a dep solver,
so order is actually important.

Change-Id: I10450de1839c41d729b606a04a944507d2427987

requirements.txt

@@ -1,9 +1,10 @@
+pbr>=0.6,!=0.7,<1.0
+
 argparse
 Babel>=1.3
 iso8601>=0.1.9
 netaddr>=0.7.6
 oslo.config>=1.4.0.0a3
-pbr>=0.6,!=0.7,<1.0
 PrettyTable>=0.7,<0.8
 requests>=1.2.1
 six>=1.7.0

test-requirements.txt

@@ -1,7 +1,8 @@
+hacking>=0.8.0,<0.9
+
 coverage>=3.6
 discover
 fixtures>=0.3.14
-hacking>=0.8.0,<0.9
 keyring>=2.1,!=3.3
 lxml>=2.3
 mock>=1.0