- Move all initialization logic to one place
- Initialize the limiter after all RPC services are registered to be able
  to validate that configured limits correspond to the methods registered
  earlier

Signed-off-by: Aleksey Savchuk <a.savchuk@yadro.com>

@@ -234,0 +258,4 @@
+	for _, limit := range limits {
+		for _, method := range limit.Keys {
+			if _, ok := availableMethods[method]; !ok {
+				return fmt.Errorf("set limit on unknown method %q", method)

@@ -234,0 +253,4 @@
+	return nil
+}
+
+func validateRPCLimits(c *cfg, limits []limiting.KeyLimit) error {