Test/Python: move and fix Map_map side-effect test
I cherry-picked it from cryptiumlabs/tezos!34
Suggested reviewers: @rafoo_ @arvidnl @tzemanovic @igarnier
Edited by Raphaël Cauderlier
I cherry-picked it from cryptiumlabs/tezos!34
Suggested reviewers: @rafoo_ @arvidnl @tzemanovic @igarnier