santad: Make driver-waiting an exponential backoff up to 16s
santad: Make driver-waiting an exponential backoff up to 16s

google/santa,tburgin/santa,mcastilho/santa,tburgin/santa,tburgin/santa,google/santa,google/santa,russellhancox/santa,mcastilho/santa,mcastilho/santa,russellhancox/santa,russellhancox/santa