Fix: sonar related fixes for LISP protocol package

Change-Id: If38ff6be071e1522c925056de44f9ec50910652c
diff --git a/protocols/lisp/ctl/src/main/java/org/onosproject/lisp/ctl/impl/LispControllerBootstrap.java b/protocols/lisp/ctl/src/main/java/org/onosproject/lisp/ctl/impl/LispControllerBootstrap.java
index 449983a..c529123 100644
--- a/protocols/lisp/ctl/src/main/java/org/onosproject/lisp/ctl/impl/LispControllerBootstrap.java
+++ b/protocols/lisp/ctl/src/main/java/org/onosproject/lisp/ctl/impl/LispControllerBootstrap.java
@@ -125,9 +125,9 @@
         try {
             eventLoopGroup = new EpollEventLoopGroup();
             channelClass = EpollDatagramChannel.class;
-        } catch (Throwable e) {
+        } catch (RuntimeException e) {
             log.debug("Failed to initialize native (epoll) transport. "
-                        + "Reason: {}. Proceeding with NIO event group.", e.getMessage());
+                        + "Reason: {}. Proceeding with NIO event group.", e);
         }
         eventLoopGroup = new NioEventLoopGroup();
         channelClass = NioDatagramChannel.class;