Add missing PrettyTable requirement
This is required as of
Make cinder-manage online migrations more verbose
@@ -34,6 +34,7 @@ osprofiler>=1.4.0 # Apache-2.0
paramiko>=2.0.0 # LGPLv2.1+
Paste # MIT
PasteDeploy>=1.5.0 # MIT
+PrettyTable>=0.7.1,<0.8 # BSD
psutil>=3.2.2 # BSD
pyparsing>=2.1.0 # MIT
python-barbicanclient!=4.5.0,!=4.5.1,>=4.0.0 # Apache-2.0
