Demote "timer stopped" warning to info & fix functional tests contains_ok function

[MetRonnie]

WARNING - stall timer stopped

is a bit noisy, demoted it to INFO

---

Functional tests: contains_ok

Setting LANG=C at the start of

LANG=C comm <(sort $FILE1) <(sort FILE2)

only applies to comm and not the sorts in the process substitutions

---

Check List

• I have read CONTRIBUTING.md and added my name as a Code Contributor.
• Contains logically grouped changes (else tidy your branch by rebase).
• Does not contain off-topic changes (use other PRs for other changes).
• No changelog, tests or docs needed as minor
• If this is a bug fix, PR should be raised against the relevant ?.?.x branch.