168dba163c
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.
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Tests of runtime checks, e.g., that named prevents duplicate processes
from running.