make STICKY so control is explicit; don't clear Imps password
the Imps password will be cleared by WelcomeActivity since that is what handles
the Cacheword instance
the STICKY flag should be used since we want to explicitly control start and stop of services
don't show unnecessary sign out toasts
order of operations fixes for proper signout/shutdown to stop all services
before the RemoteIM service was accidentally being restarted
also we need to not clear Imps password before providers can update
their signout status properly