use ticker for gregor ping loop to avoid any clock problems (#14140)
use ticker for gregor ping loop to avoid any clock problems (#14140)

* use aftertime in gregor ping loop

* use ticker

* use real ticker

keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client