Check systests.output for Grep warnings
The v9_16 branch does not have "*.log" system test artifact BIND 9.18+ has and systests.output file needs to be checked for Grep warnings instead. (See !6919 (merged).)
Validation with 52b86104 reverted:
$ ( ! grep -F "grep: warning:" bin/tests/system/systests.output )
grep: warning: stray \ before /
grep: warning: stray \ before /
grep: warning: stray \ before /
grep: warning: stray \ before /
...
grep: warning: stray \ before "
grep: warning: stray \ before "
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