CentOS: Enable os_dnsmasq_dac_override

... to avoid the following denial we've seen in CI.

avc:  denied  { dac_override } for  pid=<pid> comm="dnsmasq"
capability=1  scontext=system_u:system_r:dnsmasq_t:s0
tcontext=system_u:system_r:dnsmasq_t:s0 tclass=capability permissive=1

Change-Id: Icebf83caca27f9079e538d45432c894dfd071aae

manifests/neutron.pp

@@ -62,6 +62,13 @@ class openstack_integration::neutron (
       persistent => true,
       value      => on,
     }
+
+    if $driver == 'openvswitch' or $driver == 'linuxbridge' {
+      selboolean { 'os_dnsmasq_dac_override':
+        persistent => true,
+        value      => on,
+      }
+    }
   }
 
   openstack_integration::mq_user { 'neutron':