ConnectivityManager.setAvoidUnvalidated only works if the
config_networkAvoidBadWifi configuration is set to 0 and the
NETWORK_AVOID_BAD_WIFI setting is unset. There is no easy way
for a testing app to temporary set a test value to verify the
behavior of the API. Thus, add a mechanism to allow test app
to set a period of time to temporary unstrict the resource
configuration, i.e. Temporary simulate config_networkAvoidBadWifi
configured to 0.
Bug: 186061922
Test: atest CtsNetTestCases FrameworksNetTests
Change-Id: If772078c61a9b12926f104d5dfc9c9071e844732
6eac9fb787