The _get_datadir_path_and_priority and _parse_datastore_info_and_weight methods
may return the priority (or weight) as an integer or a string. This causes a few
issues:
- the caller must cast the result to an integer
- the code is harder to read
- static checkers such as mypy have a hard time processing these methods
We make sure that both methods now return the priority as an integer.
Closes-Bug: #1813092
Change-Id: I9435c88560b01737f9310fe2cba1ca4c84e0f3fa
ac5abddb6f