- remove polling and whiteboard unused code

...bluebutton/conference/service/poll/IPollRoomListener.java

.../java/org/bigbluebutton/conference/service/poll/Poll.java

...igbluebutton/conference/service/poll/PollApplication.java

...rg/bigbluebutton/conference/service/poll/PollHandler.java

...a/org/bigbluebutton/conference/service/poll/PollInGW.java

...a/org/bigbluebutton/conference/service/poll/PollRoom.java

...gbluebutton/conference/service/poll/PollRoomsManager.java

...ava/org/bigbluebutton/conference/service/poll/PollVO.java

...onference/service/recorder/polling/PollEventRecorder.java

...tton/conference/service/recorder/polling/PollInvoker.java

...ton/conference/service/recorder/polling/PollRecorder.java

.../conference/service/whiteboard/WhiteboardApplication.java

...tton/conference/service/whiteboard/WhiteboardService.java

...nference/service/whiteboard/red5/ClientMessageSender.java

...tton/conference/service/whiteboard/shapes/Annotation.java

.../conference/service/whiteboard/shapes/AnnotationType.java

...ebutton/conference/service/whiteboard/shapes/Ellipse.java

...bluebutton/conference/service/whiteboard/shapes/Line.java

...utton/conference/service/whiteboard/shapes/Rectangle.java

...button/conference/service/whiteboard/shapes/Scribble.java