Setting legacy-group-based-policy-dsvm-aim to non-voting gate

Neutron-lbaas was removed as part of this change:
openstack/openstack-zuul-jobs@7a3eb3afeb
This results in gating jobs to fail. Setting to non-voting till fix

Change-Id: If0b070fed753da3616bba7b6fd26b69a8d728ac4

.zuul.yaml

@@ -34,7 +34,7 @@
         - legacy-group-based-policy-dsvm-functional:
             voting: false
         - legacy-group-based-policy-dsvm-aim:
-            voting: true
+            voting: false
         - legacy-group-based-policy-dsvm-nfp:
             voting: false
     gate: