Merge pull request #11607 from aron-2809/user-logged-out

...igbluebutton/core/apps/users/RegisterUserReqMsgHdlr.scala

...g/bigbluebutton/core/apps/users/UserLeaveReqMsgHdlr.scala

...ebutton/core/apps/users/ValidateAuthTokenReqMsgHdlr.scala

...scala/org/bigbluebutton/core/models/RegisteredUsers.scala

...rc/main/scala/org/bigbluebutton/core/models/Users2x.scala

.../org/bigbluebutton/core2/message/senders/MsgBuilder.scala

...ore2/message/senders/ValidateAuthTokenRespMsgSender.scala

.../org/bigbluebutton/core2/testdata/FakeUserGenerator.scala

.../scala/org/bigbluebutton/core2/testdata/TestDataGen.scala

.../main/scala/org/bigbluebutton/common2/msgs/UsersMgs.scala

...ton-html5/imports/api/users/server/methods/userLeaving.js

...html5/imports/api/users/server/methods/userLeftMeeting.js