replication: move cluster id match check to replica

On replica subscribe master checks that replica's cluster id matches
master's one, and disallows replication in case of mismatch.
This behaviour blocks implementation of anonymous replicas, which
shouldn't pollute _cluster space and could accumulate changes from
multiple clusters at once.
So let's move the check to replica to let it decide which action to take
in case of mismatch.

Needed for #3186
Closes #3704