MM-21898: Part 2. Add opentracing (#13904)

* initial implementation of opentracing

* app layer

* Revert Makefile

* .

* cleanup

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* [ci]

* autogenerate interface

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* missed vendor files

* updated interfaces

* updated store layers

* lint fixes

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* finishing layer generators and nested spans

* added errors and b3 support

* code review

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* fixed build error due to misplased flag.Parse()

* code review addressed

store/storetest/mocks/Store.go

@@ -5,6 +5,8 @@
 package mocks
 
 import (
+	context "context"
+
 	store "github.com/mattermost/mattermost-server/v5/store"
 	mock "github.com/stretchr/testify/mock"
 )
@@ -163,6 +165,22 @@ func (_m *Store) Compliance() store.ComplianceStore {
 	return r0
 }
 
+// Context provides a mock function with given fields:
+func (_m *Store) Context() context.Context {
+	ret := _m.Called()
+
+	var r0 context.Context
+	if rf, ok := ret.Get(0).(func() context.Context); ok {
+		r0 = rf()
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(context.Context)
+		}
+	}
+
+	return r0
+}
+
 // DropAllTables provides a mock function with given fields:
 func (_m *Store) DropAllTables() {
 	_m.Called()
@@ -416,6 +434,11 @@ func (_m *Store) Session() store.SessionStore {
 	return r0
 }
 
+// SetContext provides a mock function with given fields: _a0
+func (_m *Store) SetContext(_a0 context.Context) {
+	_m.Called(_a0)
+}
+
 // Status provides a mock function with given fields:
 func (_m *Store) Status() store.StatusStore {
 	ret := _m.Called()

store/storetest/store.go

@@ -4,6 +4,8 @@
 package storetest
 
 import (
+	"context"
+
 	"github.com/mattermost/mattermost-server/v5/store"
 	"github.com/mattermost/mattermost-server/v5/store/storetest/mocks"
 	"github.com/stretchr/testify/mock"
@@ -42,8 +44,11 @@ type Store struct {
 	GroupStore                mocks.GroupStore
 	UserTermsOfServiceStore   mocks.UserTermsOfServiceStore
 	LinkMetadataStore         mocks.LinkMetadataStore
+	context                   context.Context
 }
 
+func (s *Store) SetContext(context context.Context)                { s.context = context }
+func (s *Store) Context() context.Context                          { return s.context }
 func (s *Store) Team() store.TeamStore                             { return &s.TeamStore }
 func (s *Store) Channel() store.ChannelStore                       { return &s.ChannelStore }
 func (s *Store) Post() store.PostStore                             { return &s.PostStore }