update user-guide and grant ttl operation to SET_STORAGE_GROUP privilege

[IOTDB-3938] Avoid serializing schema in wal for better write performance of standalone version (#7050)

[IOTDB-3771] Fix cannot take snapshot when the data dir and snapshot dir is on different disk (#6782)

* Fix select no files when time partition interval is too small

* rename virable name

[IOTDB-4157]read_timeseries privilege cannot use for show operation (#7029)

[IOTDB-4153]Grant ALL privileges to different paths return privilege exists (#7023)

[IOTDB-4084] remove DataNode with exit code

[IOTDB-4150] Client output has double error code #7018

[IOTDB-3938]Fix measurements check of batch insertion #7022

Bumps kafka_2.10 from 0.8.2.0 to 0.8.2.2.

---
updated-dependencies:
- dependency-name: org.apache.kafka:kafka_2.10
  dependency-type: direct:production
  update-type: version-update:semver-patch
...
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