Install etcdctl along with etcd3

It is better to have this command line tool for debugging etcd.

Change-Id: Ie0eb79d4e543df29ce6a38b57c8ef57a5d2211b4
diff --git a/lib/etcd3 b/lib/etcd3
index 51df8e4..d3f7226 100644
--- a/lib/etcd3
+++ b/lib/etcd3
@@ -107,9 +107,11 @@
 
         tar xzvf $etcd_file -C $FILES
         sudo cp $FILES/$ETCD_NAME/etcd $ETCD_BIN_DIR/etcd
+        sudo cp $FILES/$ETCD_NAME/etcdctl $ETCD_BIN_DIR/etcdctl
     fi
     if [ ! -f "$ETCD_BIN_DIR/etcd" ]; then
         sudo cp $FILES/$ETCD_NAME/etcd $ETCD_BIN_DIR/etcd
+        sudo cp $FILES/$ETCD_NAME/etcdctl $ETCD_BIN_DIR/etcdctl
     fi
 }