Fixes for Onos cord instance wrapper restart case.
Add a exception marker for logs with exceptions.

Change-Id: Ic68f15ba777768ab040c89985d7044cdf1867ef7
diff --git a/src/test/utils/OnosLog.py b/src/test/utils/OnosLog.py
index a5e0fa7..0a31b80 100644
--- a/src/test/utils/OnosLog.py
+++ b/src/test/utils/OnosLog.py
@@ -53,7 +53,9 @@
                         if t == 'Exception':
                             exception_map[t] = lines[i+1:i+1+10]
             output = '\n'.join(match_lines)
-            output += '\n'.join(exception_map['Exception'])
+            if len(exception_map['Exception']) > 0:
+                output += '\nException:\n'
+                output += '\n'.join(exception_map['Exception'])
 
         #update the last snapshot
         if cache_result is True: