Currently our functional tests for shardCollection command is scattered among several files, at least I've found the following in jstets/sharding folder:

• shard_collection_basic.js
• shard_config_db_collections.js
• shard_collection_existing_zones.js
• shard_existing_coll_chunk_count.js
• shard_collection_verify_initial_chunks.js
• initial_split_validate_shard_collections.js
• uuid_propagated_to_config_server_on_shardCollection.js

We should refactor them and possibly group them in fewer files.

Moreover most of them are blacklisted in the config continuous stepdown suite for no reasons.