separate shard and replicaset names

[shortdudey123]

Copied from edelight/chef-mongodb#95

If choosing between two recipes that accomplish the same thing, but one is simpler and the other is more complicated... which is better? I am thinking about the idea that the variable shard_name may be extraneous, and that it complicates usage of this recipe by adding yet another variable which you have to think about and understand. When setting up a shard manually (without chef), do you usually assign shard_name? A shard is either a replica set, or it's a single machine. What makes sense is to name the replica set with a replicaset_name. And just that. Only that. Perhaps I am missing something though.

tl; dr is shard_name really needed?

[github-actions]

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