Make py35 jobs voting for refstack-client
Make py35 jobs voting for refstack-client

Py35 job was added initially as non-voting. This patch is to run it
check and gate pipelines as a voting job for refstack-client.

Change-Id: If5639e66ea9d4889c7c7552b6d07f31f61b21d1f

openstack-infra/project-config,openstack-infra/project-config