Steps to Reproduce:
1. Start pool of 4 nodes.
2. Force 4 view changes (so new primary is the 1st node again).
3. Add the 5th node.
4. Send some NYMs.
5. Force 4 view changes (so new primary is the 5st node).
6. Add the 6th node.
7. Check ledger and log on the 6th node.
The 6th node isn't catched up with other 5 nodes.
There is a trace log in `systemctl status indy-node` and in journalctl.
The 6th node should work the same as the 5th node after adding.
- relates to
INDY-909 New nodes added to existing pool are unable to participate in consensus after the upgrade