Role refactor (#7867)

* role refactor

* add missing file

* fix web test

app/command_channel_header_test.go

@@ -15,7 +15,7 @@ func TestHeaderProviderDoCommand(t *testing.T) {
 	args := &model.CommandArgs{
 		T:         func(s string, args ...interface{}) string { return s },
 		ChannelId: th.BasicChannel.Id,
-		Session:   model.Session{UserId: th.BasicUser.Id, TeamMembers: []*model.TeamMember{{TeamId: th.BasicTeam.Id, Roles: model.ROLE_TEAM_USER.Id}}},
+		Session:   model.Session{UserId: th.BasicUser.Id, TeamMembers: []*model.TeamMember{{TeamId: th.BasicTeam.Id, Roles: model.TEAM_USER_ROLE_ID}}},
 	}
 
 	for msg, expected := range map[string]string{