Try to fix race condition

Author: iksaif

src/test/java/com/timgroup/statsd/UnixSocketTest.java

@@ -113,8 +113,8 @@ public void resist_dsd_restart() throws Exception {
         assertThat(lastException.getMessage(), containsString("Connection refused"));
 
         // Delete the socket file, client should throw an IOException
-        lastException = new Exception();
         socketFile.delete();
+        lastException = new Exception();
 
         client.gauge("mycount", 21);
         while(lastException.getMessage() == null) {