Switch the zuul jobs to voting

The tempest job has been stable for a while, and the kuttl job
has been recently fixed. First step towards moving from prow
to zuul.

Author: tosky

zuul.d/projects.yaml

@@ -7,8 +7,6 @@
         - manila-operator-kuttl:
             dependencies:
               - openstack-k8s-operators-content-provider
-            voting: false
         - manila-operator-tempest:
             dependencies:
               - openstack-k8s-operators-content-provider
-            voting: false