Don't auto-connect to networks that have no/limited connectivity.

Auto-reconnecting to a network with no or limited Internet
connectivity is not useful. This is because such networks cannot
be used unless the user taps the notification and interacts with
the resulting dialog. But the notification is only shown if the
user manually connects to the network, not if the system
auto-connects to it.

Bug: 130683832
Bug: 130766237
Test: atest FrameworksNetTests
Change-Id: I5413393529c4bad3a707df229307542486bcff33