FEATURES:
- mdb: Kafka user management via dedicated resource yandex_mdb_kafka_user is implemented
- clickhouse: minor refactoring of clickhouse tests
BUG FIXES:
- mongodb: fix migrate from resources to resources_* without changes
- logging: fix refresh failure if logging group has been deleted externally
- clickhouse: fix bug with count zookeepers
- kafka: fix bug in terraform acc tests, data source kafka cluster test.
- redis: fix fail on create when maintance_window equals ANYTIME