The renaming of:
`stable-large-01.aws-eu-central-1a.nimbus.prater`
to
`testing-large-01.aws-eu-central-1a.nimbus.prater`
Was done because the host was a Prater bootstrap node and it could not
be lost. The node key and the ports remained unchanged.
https://github.com/status-im/infra-nimbus/issues/60
Signed-off-by: Jakub Sokołowski <jakub@status.im>