Allow to install os-ken from git repo

os-ken is used by neutron ML2/OVS agent.
We need to install os-ken from source to test os-ken changes
against neutron. We already have tempest-integrated-networking job
in os-ken repo but it turns out it consumes os-ken from PyPI :-(

Change-Id: Ibcff212591e9fed25f1316403627269d81455b09
diff --git a/tests/test_libs_from_pypi.sh b/tests/test_libs_from_pypi.sh
index ab7583d..5b53389 100755
--- a/tests/test_libs_from_pypi.sh
+++ b/tests/test_libs_from_pypi.sh
@@ -44,7 +44,7 @@
 ALL_LIBS+=" oslo.cache oslo.reports osprofiler cursive"
 ALL_LIBS+=" keystoneauth ironic-lib neutron-lib oslo.privsep"
 ALL_LIBS+=" diskimage-builder os-vif python-brick-cinderclient-ext"
-ALL_LIBS+=" castellan python-barbicanclient ovsdbapp"
+ALL_LIBS+=" castellan python-barbicanclient ovsdbapp os-ken"
 
 # Generate the above list with
 # echo ${!GITREPO[@]}