This patch updates the `av_expand` occurences to `strings` to match the
change of the return structure of `_strings`.
We replace `+av_expand` in the headers with `+strings`, the expected
object method name from `api_av_mapping` to `api_strings_mapping` and
the internal hash key from `av_expand` to `strings`.
Test plan
1) Run the included unit tests.. all should still pass.
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
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