Confirm that we cannot alter or change the replicated cluster from the user side (only Buddy).

[donhardman]

We need to ensure that changes to the cluster, necessary for replicating shards in the auto-sharding scheme, can't be made through direct requests but are only permitted from the user side.

This task is on hold due to: manticoresoftware/manticoresearch#1423

[sanikolaev]

Can you provide an example of "changes to the cluster", so it's easier to implement the tests?

[donhardman]

We should NOT be able to perform next queries to protected cluster:

• ALTER CLUSTER <cluster_name> ADD <table_name>
• ALTER CLUSTER <cluster_name> DROP <table_name>
• DELETE CLUSTER <cluster_name>

[donhardman]

This is still blocked, cuz daemon does not implement "protected mechanism" for clusters.