Compatible with all dir paths of TiKV

[HunDunDM]

Feature Request

Is your feature request related to a problem? Please describe:

If I customize dir in TiKV's config, there will be data remaining after scale-in and prune. When the same config is used again for scale-out, an error will be reported.

tikv_servers:
  - host: 10.0.1.5
    ssh_port: 22
    port: 20160
    status_port: 20180
    deploy_dir: /data1/deploy/tikv-20160
    data_dir: /data1/data/tikv-20160
    log_dir: /data1/log/tikv-20160
    config:
        raftstore.raftdb-path: /data2/data/tikv-20160

Describe the feature you'd like:

• all dirs path is not allowed outside of tikv_servers[i].data_dir.
• OR the prune operation will clean up these extra dirs.
• OR the prune operation will prompt the user to clean up these extra dirs.

These are the configs that need attention

• --data-dir
• storage.data-dir
• raftstore.raftdb-path
• rocksdb.wal-dir
• rocksdb.info-log-dir
• rocksdb.titan.dirname
• raftdb.wal-dir
• etc

Why the featue is needed:

Describe alternatives you've considered:

Teachability, Documentation, Adoption, Migration Strategy: