Remove all @Deprecated things about *scan

* remove all @Deprecated methods about *scan
* rename ScanResult.getStringCursor() to ScanResult.getCursor()
** its original name
* let unit tests follow this change

src/main/java/redis/clients/jedis/MultiKeyCommands.java

@@ -70,13 +70,5 @@ public interface MultiKeyCommands {
 
     Long bitop(BitOP op, final String destKey, String... srcKeys);
 
-    @Deprecated
-    /**
-     * This method is deprecated due to bug (scan cursor should be unsigned long)
-     * And will be removed on next major release
-     * @see https://github.com/xetorthio/jedis/issues/531 
-     */
-    ScanResult<String> scan(int cursor);
-    
     ScanResult<String> scan(final String cursor);
 }