Increase TTL in serve-stale test

Merged Matthijs Mekking requested to merge 1192-fix-serve-stale-test-v9_14 into v9_14

Increase the short lived record TTL and negative SOA TTL to make this test less vulnerable to timing issues. The drawback is that we also have to sleep longer in this test.

(cherry picked from commit 2c0c333d)

Closes #1192 (closed)

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