Update commons-net to 2.0 to incorporate fix to this bug -

http://issues.apache.org/jira/browse/NET-36 - we saw the problem manifest in an
archive-it crawl.
* ClientFTP.java
    override buggy org.apache.commons.net.ftp.FTP.getReplyStrings() with fixed
    version, see https://issues.apache.org/jira/browse/NET-257
* .classpath, commons/pom.xml
    update dependency to 2.0 jar

commons/src/main/java/org/archive/net/ClientFTP.java

@@ -153,4 +153,10 @@ public class ClientFTP extends FTPClient implements ProtocolCommandListener {
     private void recordAdditionalInfo(String message) {
         recordControlMessage("* ", message);
     }
+    
+    // XXX see https://issues.apache.org/jira/browse/NET-257
+    @Override
+    public String[] getReplyStrings() {
+        return _replyLines.toArray(new String[0]);
+    }
 }