WifiNetworkFactory: Handle user selection

Trigger connection to a network or cancel the active network request
based on user selection (conveyed via the user selection callback by
UI).

The connection initiation logic follows existing the pattern used in
Open/Carrier-NetworkNotifier modules.

Bug: 113878056
Test: ./frameworks/opt/net/wifi/tests/wifitests/runtests.sh

Change-Id: Ieab0fbcf68bcb89e2702b3785c7e55a4098330b3
2 files changed