We can get 'PRIMARY KEY must be unique' error on some
platforms and versions of sqlite library while trying to
insert the row with the same primary key that already exist.
In this case oslo.db should raise DBDuplicateEntry error.
Add corresponding filter to _sqlite_dupe_key_error
Closes-Bug: #1386145
Change-Id: Ifafd6a8e0b613a31e596043071aef4d410a976f2