S1:N0: starts a drop database.
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S1:N0: drops all sharded collections.
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S1:N0: runs dropDB on all shards + clears the db metadata in all nodes.
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S1:N0: steps down but managed to send the command to remove the authoritative data to the CSRS.
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S1:N1: Steps up.
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S1:N1: Some operation recovers the metadata associated to the db being dropped.
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CSRS: Removes the db entry from config.databases.
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S1:N1: Resumes the execution of the dropDatabase.
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S1:N1: No information associated to that dbName is present on the CSRS, so we jump to the second phase of the coordinator, in which we send a flushRoutingTable to all nodes but the primary.
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S1:N1: Completes the execution of the dropDatabase but the primary node still believes it is the primary shard for that db name.
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