Remove unnecessary nested try/finally (#417)

* Remove unnecessary nested try/finally

* This handles the case of your concern.

An even better solution would be to have SSHClient and Session implement Auto-Closable so then you don't have to worry about doing anything in the finally block!

examples/src/main/java/net/schmizz/sshj/examples/Exec.java

@@ -20,15 +20,17 @@ public class Exec {
         try {
             ssh.authPublickey(System.getProperty("user.name"));
             final Session session = ssh.startSession();
-            try {
             final Command cmd = session.exec("ping -c 1 google.com");
             System.out.println(IOUtils.readFully(cmd.getInputStream()).toString());
             cmd.join(5, TimeUnit.SECONDS);
             System.out.println("\n** exit status: " + cmd.getExitStatus());
         } finally {
+            try {
                 session.close();
+            } catch (IOException e) {
+                // Do Nothing   
             }
-        } finally {
+            
             ssh.disconnect();
         }
     }