Perform DB truncation during recovery, send PT to storages before verification
Currently, the database may only be truncated when leaving backup mode, but the issue will be the same when neoctl gets a new command to truncate at an arbitrary tid: we want to be sure that all nodes are truncated before anything else. Therefore, we stop sending Truncate orders before stopping operation because nodes could fail/exit before actually processing them. Truncation must also happen before asking nodes their last ids. With this commit, if a truncation is requested: - this is always the first thing done when a storage node connects to the primary master during the RECOVERING phase, - and the cluster does not start automatically if there are missing nodes, unless an admin forces it. Other changes: - Connections to storage nodes don't need to be aborted anymore when leaving backup mode. - The master always initiates communication when a storage node identifies, which simplifies code and reduces the number of exchanged packets.
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