Add python-savannaclient to requirements

Savanna client CLI tests was already merged w/o adding
python-savannaclient to requirements:
I67d3d1e6f72e5c4e07cdb26743d020cb1e91a434

Change-Id: Ia3c1a7413e2f127489b641b4eaaa91cca7e7b18a
Closes-Bug: #1281954
diff --git a/requirements.txt b/requirements.txt
index 8c0f872..8573a2e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,6 +14,7 @@
 python-neutronclient>=2.3.3,<3
 python-cinderclient>=1.0.6
 python-heatclient>=0.2.3
+python-savannaclient>=0.4.1
 python-swiftclient>=1.5
 testresources>=0.2.4
 keyring>=1.6.1,<2.0,>=2.1