Fixed deprecation warning in test code.

Change-Id: I34deaedef576ebee826c81ce4a44de985cbe9ce6
diff --git a/protocols/netconf/ctl/src/test/java/org/onosproject/netconf/ctl/impl/NetconfSshdTestSubsystem.java b/protocols/netconf/ctl/src/test/java/org/onosproject/netconf/ctl/impl/NetconfSshdTestSubsystem.java
index be0c916..e10b82e 100644
--- a/protocols/netconf/ctl/src/test/java/org/onosproject/netconf/ctl/impl/NetconfSshdTestSubsystem.java
+++ b/protocols/netconf/ctl/src/test/java/org/onosproject/netconf/ctl/impl/NetconfSshdTestSubsystem.java
@@ -495,13 +495,8 @@
         outputStream.close();
     }
 
-    @Override
-    public void destroy() {
-        //Handled by interrupt
-    }
-
     protected void process(Buffer buffer) throws IOException {
-        log.warn("Receieved buffer:" + buffer);
+        log.warn("Received buffer:" + buffer);
     }
 
     public static String getTestHelloReply(Collection<String> capabilities, Optional<Long> sessionId) {