Revert "Adding oncompletionasync to sandwich bot"
Revert "Adding oncompletionasync to sandwich bot"

This reverts commit ad416a2c1cc63c662ce1b41ec0486c3494cfe8df.

xiangyan99/BotBuilder,jockorob/BotBuilder,yakumo/BotBuilder,digibaraka/BotBuilder,Clairety/ConnectMe,digibaraka/BotBuilder,yakumo/BotBuilder,mmatkow/BotBuilder,xiangyan99/BotBuilder,xiangyan99/BotBuilder,jockorob/BotBuilder,dr-em/BotBuilder,msft-shahins/BotBuilder,xiangyan99/BotBuilder,navaei/BotBuilder,msft-shahins/BotBuilder,digibaraka/BotBuilder,stevengum97/BotBuilder,digibaraka/BotBuilder,mmatkow/BotBuilder,navaei/BotBuilder,Clairety/ConnectMe,mmatkow/BotBuilder,msft-shahins/BotBuilder,stevengum97/BotBuilder,jockorob/BotBuilder,mmatkow/BotBuilder,stevengum97/BotBuilder,dr-em/BotBuilder,stevengum97/BotBuilder,Clairety/ConnectMe,dr-em/BotBuilder,Clairety/ConnectMe,jockorob/BotBuilder,yakumo/BotBuilder,dr-em/BotBuilder,navaei/BotBuilder,yakumo/BotBuilder,msft-shahins/BotBuilder,navaei/BotBuilder