Merge pull request #9610 from ritzalam/ejected-users-cannot-rejoin-issue

...n/scala/org/bigbluebutton/core/apps/PermissionCheck.scala

...button/core/apps/users/EjectDuplicateUserReqMsgHdlr.scala

...tton/core/apps/users/EjectUserFromMeetingCmdMsgHdlr.scala

...in/scala/org/bigbluebutton/core/apps/users/UsersApp.scala

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

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

...n/scala/org/bigbluebutton/core/running/MeetingActor.scala