[SERVER-52881] Fix initialization of shard cluster type mongod servers - MongoDB Jira

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Backwards Compatibility:
Fully Compatible
Operating System:
ALL
Steps To Reproduce:

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It happens from time to time in case during the time window in which replica set monitor is already initialized and topology change listerners are still not registered a topology change message arrives.

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It happens from time to time in case during the time window in which replica set monitor is already initialized and topology change listerners are still not registered a topology change message arrives.
Sprint:
Sharding 2020-11-30
Linked BF Score:
10

When initializing mongod process of shard cluster type, initialize properly its components so topology change messages do not arrive before all topology listeners have been properly added to the system. A solution is to swap first two instructions in https://github.com/mongodb/mongo/blob/7a6078c14ec31052e5109629a78c988ca417b793/src/mongo/db/s/sharding_initialization_mongod.cpp#L261