[PR #1477/d4eb13b1 backport][stable-4] ec2_placement_group: Handle a potential race creation during create #1493
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This is a backport of PR #1477 as merged into main (d4eb13b).
Address a race condition during the creation of a new Placement Group.
The consequence was a
"placement_group": null
in output after asuccessful new creation.
e.g: https://af0ac3e5f4e1620a8d63-ed3785e7f94a59162d05eede0959ab4b.ssl.cf5.rackcdn.com/1459/71e1a28c8ab7c12471b7f1cce5a37846ff642439/check/integration-community.aws-12/aa426fe/job-output.txt