Fix: do not create patch port when it is already existed on bridge

Change-Id: I3d631a91196c66fb987bacafb50985574b980709
(cherry picked from commit 90561b6d5c7a3e738432c90dc94cb0b4ae817392)
diff --git a/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/impl/NetworkAttachmentDefinitionWatcher.java b/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/impl/NetworkAttachmentDefinitionWatcher.java
index eff1ca4..2d59a2c 100644
--- a/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/impl/NetworkAttachmentDefinitionWatcher.java
+++ b/apps/kubevirt-networking/app/src/main/java/org/onosproject/kubevirtnetworking/impl/NetworkAttachmentDefinitionWatcher.java
@@ -335,7 +335,7 @@
                     return builder.build();
                 }
             } catch (JSONException e) {
-                log.error("Failed to parse network attachment definition object");
+                log.error("Failed to parse network attachment definition object", e);
             }
 
             return null;