fix memory layout descriptor parsing

Fix parsing of memory layout descriptors, which was inconsistent between spatial_layout_string_to_tuple and layout_string_to_tuple.

added Bug label

requested review from @ob28imeq

assigned to @da15siwa

mentioned in merge request !432 (merged)

added 1 commit

• 3555853d - add failing tests

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enabled an automatic merge when the pipeline for 3555853d succeeds

aborted the automatic merge because source branch was updated

added 3 commits

• 3555853d...8081e9b2 - 2 commits from branch master
• eb21c7ea - Merge branch 'master' into fhennig/fix-memory-descriptor-legacy

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Fixing the multiarch pipelines will take a little longer, so we can as well merge this

merged

mentioned in commit 5600b6b6