Support new Management service protocol (NetworkMap) (#193)

* feature: support new management service protocol

* chore: add more logging to track networkmap serial

* refactor: organize peer update code in engine

* chore: fix lint issues

* refactor: extract Signal client interface

* test: add signal client mock

* refactor: introduce Management Service client interface

* chore: place management and signal clients mocks to respective packages

* test: add Serial test to the engine

* fix: lint issues

* test: unit tests for a networkMapUpdate

* test: unit tests Sync update

signal/client/mock.go

@@ -0,0 +1,72 @@
+package client
+
+import (
+	"github.com/wiretrustee/wiretrustee/signal/proto"
+)
+
+type MockClient struct {
+	CloseFunc               func() error
+	GetStatusFunc           func() Status
+	StreamConnectedFunc     func() bool
+	ReadyFunc               func() bool
+	WaitStreamConnectedFunc func()
+	ReceiveFunc             func(msgHandler func(msg *proto.Message) error) error
+	SendToStreamFunc        func(msg *proto.EncryptedMessage) error
+	SendFunc                func(msg *proto.Message) error
+}
+
+func (sm *MockClient) Close() error {
+	if sm.CloseFunc == nil {
+		return nil
+	}
+	return sm.CloseFunc()
+}
+
+func (sm *MockClient) GetStatus() Status {
+	if sm.GetStatusFunc == nil {
+		return ""
+	}
+	return sm.GetStatusFunc()
+}
+
+func (sm *MockClient) StreamConnected() bool {
+	if sm.StreamConnectedFunc == nil {
+		return false
+	}
+	return sm.StreamConnectedFunc()
+}
+
+func (sm *MockClient) Ready() bool {
+	if sm.ReadyFunc == nil {
+		return false
+	}
+	return sm.ReadyFunc()
+}
+
+func (sm *MockClient) WaitStreamConnected() {
+	if sm.WaitStreamConnectedFunc == nil {
+		return
+	}
+	sm.WaitStreamConnectedFunc()
+}
+
+func (sm *MockClient) Receive(msgHandler func(msg *proto.Message) error) error {
+	if sm.ReceiveFunc == nil {
+		return nil
+	}
+	return sm.ReceiveFunc(msgHandler)
+}
+
+func (sm *MockClient) SendToStream(msg *proto.EncryptedMessage) error {
+	if sm.SendToStreamFunc == nil {
+		return nil
+	}
+	return sm.SendToStreamFunc(msg)
+}
+
+func (sm *MockClient) Send(msg *proto.Message) error {
+	if sm.SendFunc == nil {
+		return nil
+	}
+	return sm.SendFunc(msg)
+}