[WIP] Upgrade ONOS to karaf version 4.2.1

Change-Id: I7cd40c995bdf1c80f94b1895fb3344e32404c7fa
diff --git a/cli/src/main/java/org/onosproject/cli/PlaceholderCompleter.java b/cli/src/main/java/org/onosproject/cli/PlaceholderCompleter.java
index bba871e..537aa28 100644
--- a/cli/src/main/java/org/onosproject/cli/PlaceholderCompleter.java
+++ b/cli/src/main/java/org/onosproject/cli/PlaceholderCompleter.java
@@ -16,7 +16,9 @@
 
 package org.onosproject.cli;
 
-import org.apache.karaf.shell.console.completer.StringsCompleter;
+import org.apache.karaf.shell.api.console.CommandLine;
+import org.apache.karaf.shell.api.console.Session;
+import org.apache.karaf.shell.support.completers.StringsCompleter;
 
 import java.util.List;
 import java.util.SortedSet;
@@ -28,13 +30,13 @@
 public class PlaceholderCompleter extends AbstractCompleter {
 
     @Override
-    public int complete(String s, int i, List<String> list) {
+    public int complete(Session session, CommandLine commandLine, List<String> candidates) {
         // Populate a string completer with what the user has typed so far
         StringsCompleter delegate = new StringsCompleter();
         SortedSet<String> strings = delegate.getStrings();
-        if (s != null) {
-            strings.add(s);
+        if (commandLine.getCursorArgument() != null) {
+            strings.add(commandLine.getCursorArgument());
         }
-        return delegate.complete(s, i, list);
+        return delegate.complete(session, commandLine, candidates);
     }
 }