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

pkg/env/env.go

@@ -27,6 +27,12 @@ func SetEnvOn() {
 	envOff = false
 }
 
+// IsSet returns if the given env key is set.
+func IsSet(key string) bool {
+	_, ok := os.LookupEnv(key)
+	return ok
+}
+
 // Get retrieves the value of the environment variable named
 // by the key. If the variable is present in the environment the
 // value (which may be empty) is returned. Otherwise it returns