Keep staying at below transition score for a certain time

This patch is to keep staying at below transition score for
a certain period of time when falling below the transition score
to prevent going back to wifi network again in a short time.
The purpose of this change is for user experience improvement.

Bug: 120951354
Test: Manual
Test: Unit test
Signed-off-by: Daichi Ueura <daichi.ueura@sony.com>
Change-Id: I9823495edcfebfe1d459ba6f57fd3a77eb09ef80
2 files changed