Rename the settings whose names do not say what they control (closes #234)

Applies the setting renames of the naming audit under the SWW_WAF_ and
SWW_RPROXY_ prefixes, with sneak's names for the IP reputation cache
time and the two time limits, which now take milliseconds. The rproxy
log field default_disposition becomes waf_backend_no_answer, and
config.Config and config.FromEnvironment become config.WAF and
config.WAFFromEnvironment. Go fields, test names and prose follow. No
aliases; nothing reads the old names.

Model: opus-5-5

internal/waf/dnsbl.go

@@ -1,6 +1,6 @@
 package waf
 
-// The heuristic dnsbl. It reads SWW_WAF_REPUTATION_ACTION, and the DNSBL zones'
+// The heuristic dnsbl. It reads SWW_WAF_DNSBL_ABUSEIPDB_ACTION, and the DNSBL zones'
 // verdicts through the DNSBL checker.
 
 import (
@@ -14,7 +14,7 @@ import (
 
 // dnsbl notes the DNSBL zones whose verdict lists the client, as noteListed
 // does, adds the tag dnsbl=<zone> for each, the zone's key masked, and refuses
-// the request when SWW_WAF_REPUTATION_ACTION is deny. Being
+// the request when SWW_WAF_DNSBL_ABUSEIPDB_ACTION is deny. Being
 // limit, it lowers the client's limits instead (see limitPercentages), and
 // being log, it does nothing more. A zone without a verdict on the client is
 // asked about it in the background, and the request does not wait for the
@@ -32,7 +32,7 @@ func (dnsbl) check(ctx context.Context, rq *request, _ time.Time) *verdict {
 		rq.addTag(config.DNSBLTagPrefix + strings.ToLower(zone))
 	}
 
-	if !rq.dnsblListed || rq.h.config.ReputationAction != deny {
+	if !rq.dnsblListed || rq.h.config.DNSBLAbuseIPDBAction != deny {
 		return nil
 	}