Make API test_multiple_paths green again

Update OperatingSystem entity and map remote to local paths
Update str_type parameter in Role entity name field
Improve StringField to convert to a tuple if a string is given as
str_type
Improve skip_if_sam helper method to deal with entities modified by
functools.partial

Related to #1452
Would it be more straightforward to check if `str_type` is an instance of `tuple`?