AMBARI-26556: Add a way to encrypted configurations.json file in the ambari-agent's cache

[prabhjyotsingh]

What changes were proposed in this pull request?

Add a way to encrypted configurations.json file in the ambari-agent's cache

How was this patch tested?

before enabling encryption:

cluster_cache]# cat configurations.json 
{
  "2": {
    "configurations": {
      "admin-logback": {
        "content": "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<!--\n  Licensed to the Apache Software Foundation (ASF) under one or more\n  contributor license agreements.  See the NOTICE file distributed with\n  this work for additional information regarding copyright ownership.\n  The ASF licenses this file to You under the Apache License, Version 2.0\n  (the \"License\"); 

after enabling encryption:

cluster_cache]# cat configurations.json 
 b'${enc=aes128_hex, value=35343134333930393632613735326136333432373638353461333162313635613a3a373......

[JiaLiangC]

@prabhjyotsingh plz add some unit test for your change

[prabhjyotsingh]

@JiaLiangC sure I've added a few.

[prabhjyotsingh]

@JiaLiangC can you help me review this PR?

[prabhjyotsingh]

@JiaLiangC can you help me review this PR?

After spending more time on this, I realized there’s an internal implementation of ambari_pbkdf2, so I decided to use that instead.