Restore API compatibility

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/net/branches/NET_2_0@962818 13f79535-47bb-0310-9956-ffa450edef68

Author: sebbASF

src/main/java/org/apache/commons/net/ftp/FTPSClient.java

@@ -42,6 +42,22 @@
  */
 public class FTPSClient extends FTPClient {
 
+    /** @deprecated - not used - will be removed in next major release */
+    @Deprecated
+    public static String KEYSTORE_ALGORITHM;
+
+    /** @deprecated - not used - will be removed in next major release */
+    @Deprecated
+    public static String TRUSTSTORE_ALGORITHM;
+
+    /** @deprecated - not used - will be removed in next major release */
+    @Deprecated
+    public static String PROVIDER;
+
+    /** @deprecated - not used - will be removed in next major release */
+    @Deprecated
+    public static String STORE_TYPE;
+    
     /** The value that I can set in PROT command  (C = Clear, P = Protected) */
     private static final String[] PROT_COMMAND_VALUE = {"C","E","S","P"};
     /** Default PROT Command */