add rtmp fallback for ipv4-only hostname to the client

bigbluebutton-client/resources/config.xml.template

.../src/org/bigbluebutton/core/managers/ConnectionManager.as

...t/src/org/bigbluebutton/core/services/BandwidthMonitor.as

.../src/org/bigbluebutton/main/maps/ApplicationEventMap.mxml

.../src/org/bigbluebutton/main/model/modules/ModulesProxy.as

...c/org/bigbluebutton/main/model/options/PortTestOptions.as

...g/bigbluebutton/main/model/users/NetConnectionDelegate.as

...bigbluebutton/modules/phone/managers/ConnectionManager.as

...luebutton/modules/screenshare/services/red5/Connection.as

...reenshare/view/components/WebRTCDesktopPublishWindow.mxml

.../screenshare/view/components/WebRTCDesktopViewWindow.mxml

...rg/bigbluebutton/modules/videoconf/business/VideoProxy.as

...t/src/org/red5/flash/bwcheck/app/BandwidthDetectionApp.as