OS-1572 Explicitly handle all possible enum values in switches
Reviewed by: Robert Mustacchi <rm@joyent.com>

@@ -253,10 +253,12 @@
                         case ZONE_IS_DOWN:
                         case ZONE_IS_DYING:
                         case ZONE_IS_DEAD:
                                 /* FALLTHRU */
                                 continue;
+                        default:
+                                break;
                 }
                 if ((res = dlmgmt_zone_init(zids[i])) != 0) {
                         (void) fprintf(stderr, "zone (%ld) init error %s",
                             zids[i], strerror(res));
                         dlmgmt_log(LOG_ERR, "zone (%d) init error %s",