Name request log actions so they say what they mean (closes #229)

The request log's `action` values now say what they mean, as sneak named them: `request_header_too_large`, `client_is_rate_limited`, `blocked_by_block_rule` and `client_denied`, with no aliases. `banned` splits into `temporarily_banned` and `permanently_banned`, by whether the ban runs out. When a permanent ban also covers a client, that ban is the one reported.

Trips a reader: a request over a rate limit stays `client_is_rate_limited` even when the ban it makes is permanent.
Disclosure: the offence key `rule_blocked` is renamed in `clients.json` too, so an existing file holding it stops the start and must be removed. Its `version` stays 1.

Model: opus-5-5

internal/discriminator/lookup_test.go

@@ -40,7 +40,7 @@ func TestEveryClientIsLookedUpWithoutWaitingWhileNoSettingNeedsIt(t *testing.T)
 	// comes too. None waits for GeoJS.
 	for _, line := range []logLine{
 		s.get(fromDE, http.StatusOK, requestlog.ActionForward),
-		s.get(fromDE, http.StatusForbidden, requestlog.ActionRateLimited),
+		s.get(fromDE, http.StatusForbidden, requestlog.ActionClientIsRateLimited),
 		s.get(fromKP, http.StatusOK, requestlog.ActionForward),
 	} {
 		got := asnAndCountry{line.ASN, line.ASName, line.Country}
@@ -179,7 +179,7 @@ func TestASNumberAndNameInTheLogLineTheHistoryTheBanNotesAndTheAlert(t *testing.
 
 	for _, line := range []logLine{
 		s.get(fromDE, http.StatusOK, requestlog.ActionForward),
-		s.get(fromDE, http.StatusForbidden, requestlog.ActionRateLimited),
+		s.get(fromDE, http.StatusForbidden, requestlog.ActionClientIsRateLimited),
 	} {
 		if got := (asnAndCountry{line.ASN, line.ASName, line.Country}); got != want {
 			t.Errorf("log line has %+v, want %+v", got, want)
@@ -264,7 +264,7 @@ func TestClientsAreLookedUpInTheLookupDatabaseAndGeoJSIsNotAsked(t *testing.T) {
 		want asnAndCountry
 	}{
 		{s.get(fromDE, http.StatusOK, requestlog.ActionForward), de},
-		{s.get(fromDE, http.StatusForbidden, requestlog.ActionRateLimited), de},
+		{s.get(fromDE, http.StatusForbidden, requestlog.ActionClientIsRateLimited), de},
 		{
 			s.get(fromKP, http.StatusForbidden, requestlog.ActionCountryDenied),
 			asnAndCountry{asnKP, asNameKP, "KP"},