make test work under java 1.5

Author: Matthias Radestock

test/src/com/rabbitmq/client/test/Bug19356Test.java

@@ -55,9 +55,9 @@ public void openConnection()
         try {
             connectionFactory.useSslProtocol();
         } catch (NoSuchAlgorithmException ex) {
-            throw new IOException(ex);
+            throw new IOException(ex.toString());
         } catch (KeyManagementException ex) {
-            throw new IOException(ex);
+            throw new IOException(ex.toString());
         }