Merge pull request #10667 from jfsiebel/improve-streamer-and-error-logs

...l5/imports/api/users/server/handlers/validateAuthToken.js

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

...ml5/imports/api/users/server/methods/validateAuthToken.js

bigbluebutton-html5/imports/api/users/server/publishers.js

bigbluebutton-html5/imports/ui/components/cursor/service.js

...ebutton-html5/imports/ui/components/whiteboard/service.js

bigbluebutton-html5/imports/ui/services/auth/index.js