Add python-openstacksdk to python3 enabled list

It's perfectly with with python3, add it to the list.

Change-Id: Ieb9f563a2f95e78a994cef388e56a6d5a84c8935
diff --git a/stackrc b/stackrc
index ffe4050..286a04d 100644
--- a/stackrc
+++ b/stackrc
@@ -121,7 +121,7 @@
 # base name of the directory from which they are installed. See
 # enable_python3_package to edit this variable and use_python3_for to
 # test membership.
-export ENABLED_PYTHON3_PACKAGES="nova,glance,cinder,uwsgi,python-openstackclient"
+export ENABLED_PYTHON3_PACKAGES="nova,glance,cinder,uwsgi,python-openstackclient,python-openstacksdk"
 
 # Explicitly list services not to run under Python 3. See
 # disable_python3_package to edit this variable.