SONAR suggestion - proper handling of InterruptedException

Change-Id: I67a93c064708c207d9ce83fac319682c2d17db60
diff --git a/apps/route-service/app/src/main/java/org/onosproject/routeservice/impl/RouteManager.java b/apps/route-service/app/src/main/java/org/onosproject/routeservice/impl/RouteManager.java
index 0dc5dbe..e1acc2c 100644
--- a/apps/route-service/app/src/main/java/org/onosproject/routeservice/impl/RouteManager.java
+++ b/apps/route-service/app/src/main/java/org/onosproject/routeservice/impl/RouteManager.java
@@ -343,6 +343,7 @@
                     listener.event(queue.take());
                 } catch (InterruptedException e) {
                     log.info("Route listener event thread shutting down: {}", e.getMessage());
+                    Thread.currentThread().interrupt();
                     break;
                 } catch (Exception e) {
                     log.warn("Exception during route event handler", e);