gh-664: switchover api #679
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The following API introduced (works only with stateful failover):
- cartridge.lua-api.failover.promote({[replicaset_uuid] = leader_uuid, ...})
- cartridge.failover_promote({[replicaset_uuid] = leader_uuid, ...})
GraphQL:
```graphql
mutation(
$replicaset_uuid: String!
$instance_uuid: String!) {
cluster {
failover_promote(
replicaset_uuid: $replicaset_uuid
instance_uuid: $instance_uuid
) {}
}
}
```
Closes #664
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I didn't forget about
Close #664