Tests that wait for a lookup answer give it an hour (closes #119)

Ten tests in internal/proxy set a country list, a biased threshold or
SWWAF_ADD_LOOKUP_HEADERS, and expected the GeoJS stand-in's answer within
the default SWWAF_LOOKUP_TIMEOUT of one second on the real clock. A
hold-up of the test process past it left the client unknown. Each now
sets SWWAF_LOOKUP_TIMEOUT to an hour, and the comment on startGeoJS asks
the same of later tests.

Judgement call: set in each test, not as a default in newProxy, where it
would change two tests that rely on the default second.

Model: opus-5-5

internal/proxy/lookup_test.go

@@ -249,6 +249,7 @@ func TestLookupHeadersArePassedToTheAppAndTheClientsOwnRemoved(t *testing.T) {
 	geojsURL, _ := startGeoJS(t)
 	addr, out, _ := startProxyWithClock(t, app.URL, geojsURL, time.Now, map[string]string{
 		trustedProxies:   trustLocalhost,
+		lookupTimeout:    "1h",
 		addLookupHeaders: "true",
 	})
 	s := &sender{t: t, addr: addr, out: out}