Fix WiFiNetworkAgent#unwanted

1) No longer blacklist a network when it's unwanted by NetworkAgent.
2) Deprecate the network disable reason BAD_LINK.
3) Stop WiFi Auto_Connect attempt if neither saved Wifi network nor
   untrusted WiFi network is requested.

Bug: 28558417
Tests: Unit Tests and manual tests
Change-Id: I2b245cfb357b92ed925d89603e0fefded9d6865a
4 files changed
tree: aae43b1b5b8041ea62e90ad6536edf6c7017bb9c
  1. service/
  2. tests/