servewaf always answers rproxy well within its time limit (closes #182)

A question waits on GeoJS at most 800ms, the new default of
SWWAF_LOOKUP_TIMEOUT. In enforce mode it does not wait at all when it is
over the header limits, on a fetched blocklist with deny, on the CrowdSec
decision list, or over a whole rate limit. Not waiting never lowers a
client's limit. Just before the Core Rule Set, servewaf refuses more than
50 cookies or 100 header fields with 431.

Shared default changed: SWWAF_LOOKUP_TIMEOUT also applies to smallwebwaf
with no command.
Judgement call: SWWAF_REPUTATION_TIMEOUT stays 2s, since no request waits
on the DNS blocklists or AbuseIPDB.

Model: opus-5-5

internal/proxy/biased_test.go

@@ -284,7 +284,7 @@ func TestClientWithoutAnAnswerInTimeHasTheUnknownLimitPercent(t *testing.T) {
 		server, out, _ := newProxy(t, "http://app.invalid", unansweredGeoJSURL,
 			time.Now, map[string]string{unknownLimitPercent: "0"})
 
-		// Once the second the request waits for its answer is up, the client
+		// Once the time the request waits for its answer is up, the client
 		// counts as without a country, and its zero allowance refuses the
 		// request before it reaches the app.
 		serveFromDE(t, server, http.MethodGet, http.NoBody)