service startup scan fix

When service is started up, a quick low-latency scan is started. After
a short duration, the low-latency scan is stopped, and the low-power
scan is then started.
Merge pull request #243 from matthewsibigtroth/service_startup_scan_fix

service startup scan fix
Revert "service startup scan fix"
Merge pull request #245 from google/revert-243-service_startup_scan_fix

Revert "service startup scan fix"