f9e075175d
The old name "common" clashes with the convention of system test
directory naming. It appears as a system test directory, but it only
contains helper files.
To reduce confusion and to allow automatic detection of issues with
possibly missing test files, rename the helper directory to "_common".
The leading underscore indicates the directory is different and the its
name can no longer be confused with regular system test directories.
(cherry picked from commit 168dba163c)
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Tests of runtime checks, e.g., that named prevents duplicate processes
from running.