Merge branch 'AthenaIO_SharedWriterIncidentFix2' from 'master' to '21.2'

Peter Van Gemmerenrequested to merge
cherry-pick-6682b9f7 into 21.2

Fix needed as shared memory segments may have names "SHM" + client number.

See merge request !24314 (merged)

(cherry picked from commit 6682b9f7)

71c0630b Fix needed as shared memory segments may have names "SHM" + client number.

Edited by Peter Van Gemmeren

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