SONAR suggestion - proper handling of InterruptedException

Change-Id: I67a93c064708c207d9ce83fac319682c2d17db60
diff --git a/providers/pcep/tunnel/src/main/java/org/onosproject/provider/pcep/tunnel/impl/PcepTunnelProvider.java b/providers/pcep/tunnel/src/main/java/org/onosproject/provider/pcep/tunnel/impl/PcepTunnelProvider.java
index 9b936e8..a6fa58b 100644
--- a/providers/pcep/tunnel/src/main/java/org/onosproject/provider/pcep/tunnel/impl/PcepTunnelProvider.java
+++ b/providers/pcep/tunnel/src/main/java/org/onosproject/provider/pcep/tunnel/impl/PcepTunnelProvider.java
@@ -1969,6 +1969,7 @@
                     executor.awaitTermination(WAIT_TIME, TimeUnit.SECONDS);
                 } catch (InterruptedException e) {
                     log.error("updating delegation failed");
+                    Thread.currentThread().interrupt();
                 }
             }
         }