Pin GitPython version to prevent test failure

Change-Id: I3cadf46e3b5d9264040d1a24535fa77b276f9236
diff --git a/requirements.txt b/requirements.txt
index 50726c0..dd947d6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@
 Paste
 WebOb>=1.2.3,<1.3
 paramiko>=1.8.0
-GitPython>=0.3.2.RC1
+GitPython==0.3.2.RC1
 lockfile>=0.8
 ordereddict
 python-daemon