Improve sharding test to confirm UUID consistency

ReplSetTest.prototype.checkReplicatedDataHashes() verifies that collection options returned by the "listCollections" command are exactly equal on the primary and secondary nodes. This implicitly verifies that the UUID of the collection created on the primary matches the UUID of the collection created on the secondary.

We should add a similar kind of validation to ShardingTest to ensure that the UUID for a collection is consistent across all shards.