bpo-38119: Fix shmem resource tracking#15989

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applio wants to merge 3 commits intopython:mainfrom

applio:fix_shmem_resource_tracking

Commits on Sep 11, 2019

Eliminated premature destruction of shared memory segments by resource tracker.
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Add test verifying shared memory available to other processes with handle after any one independent process exit.
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Add blurb.
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