Move HTTPService and ConfigService into services package (#9422)

* Move HTTPService and ConfigService into utils package

* Re-add StaticConfigService

* Move config and http services into their own packages

utils/testutils/mocked_http_service.go

@@ -0,0 +1,28 @@
+// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package testutils
+
+import (
+	"net/http"
+	"net/http/httptest"
+)
+
+type MockedHTTPService struct {
+	Server *httptest.Server
+}
+
+func MakeMockedHTTPService(handler http.Handler) *MockedHTTPService {
+	return &MockedHTTPService{
+		Server: httptest.NewServer(handler),
+	}
+}
+
+func (h *MockedHTTPService) MakeClient(trustURLs bool) *http.Client {
+	return h.Server.Client()
+}
+
+func (h *MockedHTTPService) Close() {
+	h.Server.CloseClientConnections()
+	h.Server.Close()
+}

utils/testutils/static_config_service.go

@@ -0,0 +1,24 @@
+// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package testutils
+
+import (
+	"github.com/mattermost/mattermost-server/model"
+)
+
+type StaticConfigService struct {
+	Cfg *model.Config
+}
+
+func (s StaticConfigService) Config() *model.Config {
+	return s.Cfg
+}
+
+func (StaticConfigService) AddConfigListener(func(old, current *model.Config)) string {
+	return ""
+}
+
+func (StaticConfigService) RemoveConfigListener(string) {
+
+}