Currently we have two namespace functions:

• isNamespaceAlwaysUntracked()
• isShardLocalNamespace() 

This two functions have duplicated code. Considering that it should always be impossible to track a namespace that is considered local to a shard (e.g. config.cache.chunks) we should be able to remove the code duplication. Theoretically we should be able to implement isNamespaceAlwaysUntracked() by re-using the isShardLocalNamespace() function internally.