fix(gce): log all zones when configure zones explicit

Author: edgarulg

clouddriver-google/src/main/java/com/netflix/spinnaker/clouddriver/google/deploy/handlers/BasicGoogleDeployHandler.java

@@ -966,7 +966,7 @@ protected void setDistributionPolicyToInstanceGroup(
         log.info(
             String.format(
                 "Configuring explicit zones selected for regional server group: %s",
-                description.getDistributionPolicy().getZones().get(0)));
+                String.join(", ", description.getDistributionPolicy().getZones())));
         List<DistributionPolicyZoneConfiguration> selectedZones =
             description.getDistributionPolicy().getZones().stream()
                 .map(