Merge branch 'v2.2.x-release' of github.com:bigbluebutton/bigbluebutton into feb18-merge

...rc/main/scala/org/bigbluebutton/SystemConfiguration.scala

...in/scala/org/bigbluebutton/core/apps/voice/VoiceApp.scala

akka-bbb-apps/src/universal/conf/application.conf

...witch/voice/freeswitch/actions/GetUsersStatusCommand.java

...tml5/imports/api/voice-users/server/methods/muteToggle.js

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

...l5/imports/ui/components/external-video-player/service.js

...uebutton-html5/imports/ui/services/audio-manager/index.js

bigbluebutton-html5/private/config/settings.yml

...rs/org/bigbluebutton/web/controllers/ApiController.groovy