Dataset add --auto-match option is redundant

[Kirill888]

• It's enabled by default even if not supplied
• It suggests that without it there is a manual product association, but no such thing exists
• Manual product association is not even possible due to handling of lineage datasets

dataset add always performs matching of dataset definition document to a set of product definitions. A set of products being matched against is either

• Full set of products in the database (default behaviour)
• Subset of products from the database (product to match against are specified with multiple --dtype options)
• Subset of products from the database with some modifications loaded from a file with --match-rules option (I suggest we get rid of this one)

Because dataset add supports adding datasets found in the lineage subdocument to the database there is no way to supply "manual" product<->dataset relation in a general case.