Luke Kysow a1e6d69454
peering: add config to enable/disable peering (#13867)
* peering: add config to enable/disable peering

Add config:

```
peering {
  enabled = true
}
```

Defaults to true. When disabled:
1. All peering RPC endpoints will return an error
2. Leader won't start its peering establishment goroutines
3. Leader won't start its peering deletion goroutines
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