Propagate raft_recover errors and improve tracing #702
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At the moment, the raft_recover error messages are not propagated, so the caller gets a cryptic error code (1), without further details.
This change ensures that the error messages are propagated and adds a few extra trace messages.
Furthermore, tracing is disabled unless we start the node (not the case when we're actually trying to recover it). For now, we're adding a "dqliteTracingMaybeEnable" call in "dqlite_node_recover_ext".