When a client-storage connection breaks, the storage node discards data of all
ongoing transactions by the client. Therefore, a reconnection within the
context of the transaction is wrong, as it could lead to partially-written
transactions.

This fixes cases where such reconnection happened. The biggest issue was that
the mechanism to dispatch disconnection events only works when waiting for an
answer.

The client can still reconnect for other purposes but the new connection won't
be reused by transactions that already involved the storage node.