#146 Terms of Service Phase 2 (#9731)

* #132 added UserTermsOfService model

* #132 added UserTermsOfService model

* #132 added logic to save user TOS data in a new table

* #132 Added logic to save and delete user TOS. Updated user TOS action logic

* #132 updated store mocks

* #132 added tests

* #132 removed cache from UserTermsOfService SQL store

* #132 fixed styling and license check

* #132 added message translations in en.json

* #132 fixed save user TOS logic to work second time as well

* #132 removed User.AcceptedTermsOfService colum and migrated accepted TOS data into new table

* #132 fixed formatting

* #132 fixed formatting

* #146 added field 'mandatory' to terms of service

* #146 updated tests

* #146 added getLatestTermsOfService API

* #146 Added tests

* #146 fixed styling

* #146 removed code for managing mandatory/optional TOS

* #146 Added TOS re-acceptance period config

* #146 fixed styling

* #146 removed some code left for debugging

* #146 added TOS re-acceptance period in config

* #146 fixed a json name from service_terms to terms_of_service

* #146 Minor refactoring and added TOS re-acceptance period to diagnistics

* Fixed style

* Updated upgraded script to keep app backward compatible

model/user_terms_of_Service_test.go

@@ -0,0 +1,46 @@
+// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package model
+
+import (
+	"github.com/stretchr/testify/assert"
+	"strings"
+	"testing"
+)
+
+func TestUserTermsOfServiceIsValid(t *testing.T) {
+	s := UserTermsOfService{}
+
+	if err := s.IsValid(); err == nil {
+		t.Fatal("should be invalid")
+	}
+
+	s.UserId = NewId()
+	if err := s.IsValid(); err == nil {
+		t.Fatal("should be invalid")
+	}
+
+	s.TermsOfServiceId = NewId()
+	if err := s.IsValid(); err == nil {
+		t.Fatal("should be invalid")
+	}
+
+	s.CreateAt = GetMillis()
+	if err := s.IsValid(); err != nil {
+		t.Fatal("should be valid")
+	}
+}
+
+func TestUserTermsOfServiceJson(t *testing.T) {
+	o := UserTermsOfService{
+		UserId:           NewId(),
+		TermsOfServiceId: NewId(),
+		CreateAt:         GetMillis(),
+	}
+	j := o.ToJson()
+	ro := UserTermsOfServiceFromJson(strings.NewReader(j))
+
+	assert.NotNil(t, ro)
+	assert.Equal(t, o, *ro)
+}