stress2: Avoid the use of grep ... | awk

[bcr]

Summary

Remove grep from passing data to awk via a pipe in favor of using awk's // (constant regular expression search) functionality. This way, we save a pipe invocation while the functionality stays the same. It aims readability by shortening a long chain of pipes somewhat. See also D40801.

Test Plan

1. Apply patch
2. Test stress2 scripts again for functionality
3. comment/approve