Fix review comments and new changes in config (#8515)

- Migrate and save only settings which are enabled
- Rename logger_http to logger_webhook and
  logger_http_audit to audit_webhook
- No more pretty printing comments, comment
  is a key=value pair now.
- Avoid quotes on values which do not have space in them
- `state="on"` is implicit for all SetConfigKV unless
  specified explicitly as `state="off"`
- Disabled IAM users should be disabled always

cmd/config/cache/lookup.go

@@ -73,6 +73,10 @@ func LookupConfig(kvs config.KVS) (Config, error) {
 	// Check if cache is explicitly disabled
 	stateBool, err := config.ParseBool(env.Get(EnvCacheState, kvs.Get(config.State)))
 	if err != nil {
+		// Parsing failures happen due to empty KVS, ignore it.
+		if kvs.Empty() {
+			return cfg, nil
+		}
 		return cfg, err
 	}