Make PyPy gate job non-voting for python-troveclient

python-troveclient has a dependency on lxml which is causing the
PyPy gate job to fail. Making it non-voting until we can pull
out the xml support for the trove client.

Change-Id: I058cf9790ae0754999f7084206bb3e2df4b77b00

modules/openstack_project/files/zuul/layout.yaml

@@ -430,6 +430,8 @@ jobs:
     voting: false
   - name: gate-python-tuskarclient-python33
     voting: false
+  - name: gate-python-troveclient-pypy
+    voting: false
   - name: gate-mistral-python33
     voting: false
   - name: gate-mistral-extra-python33