Merge pull request #6187 from ritzalam/delay-removing-user-when-leaving

.../apps/users/UserJoinMeetingAfterReconnectReqMsgHdlr.scala

...luebutton/core/apps/users/UserJoinMeetingReqMsgHdlr.scala

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

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

...scala/org/bigbluebutton/core/running/HandlerHelpers.scala

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

...scala/org/bigbluebutton/core2/testdata/FakeTestData.scala

...nt/src/org/bigbluebutton/core/model/users/VoiceUsers2x.as

...g/bigbluebutton/modules/users/services/MessageReceiver.as