WifiServiceImpl: Factory reset

Clear the following lists on the network settings reset:
a) Blacklisted ephemeral networks
b) All suggestion related lists.
c) All user approvals stored for networks requests.

Bug: 123884704
Test: ./frameworks/opt/net/wifi/tests/wifitests/runtests.sh
Test: Manually verified by performing network settings reset
Change-Id: I8a6476acf4a14acf968565cad1a6eb1c6aef1f55
7 files changed