SupplicantScannerImpl: Change PNO scan log location

Since PNO scans are started by the PNO debouncer (which debounces PNO state
change for 5 seconds), the log message stating that we have started PNO
scan should be moved to the location where the scan is actually started.

This removes the confusion from the logs in the below case:
05-16 16:51:40.135 D/SupplicantWifiScannerImpl(  876): Change PNO state
from false to true
05-16 16:51:42.356 D/SupplicantWifiScannerImpl(  876): Change PNO state
from true to false
05-16 16:51:45.109 D/SupplicantWifiScannerImpl(  876): Start PNO timer
with delay 2247
05-16 16:51:45.116 D/SupplicantWifiScannerImpl(  876): Starting wifi PNO
scan
05-16 16:51:50.111 D/SupplicantWifiScannerImpl(  876): Change PNO state
from false to true
05-16 16:51:52.368 D/SupplicantWifiScannerImpl(  876): Change PNO state
from true to false
05-16 16:51:55.143 D/SupplicantWifiScannerImpl(  876): Start PNO timer
with delay 2225
05-16 16:51:55.148 D/SupplicantWifiScannerImpl(  876): Starting wifi PNO
scan

BUG: 28800979
Change-Id: Ib4cc7c59fde83a02a2b938fb334a85f0c046cd87
1 file changed
tree: f382ccb1846e121f3c93a62538ca02dba994f781
  1. service/
  2. tests/