Update AMS to use NetworkManagementInternal.isNetworkRestrictedForUid.

And add global setting WAIT_FOR_NETWORK_TIMEOUT_MS.

Bug: 27803922
Test: runtest -c com.android.server.am.ActivityManagerServiceTest frameworks-services
      cts-tradefed run singleCommand cts-dev --module CtsHostsideNetworkTests -t com.android.cts.net.HostsideRestrictBackgroundNetworkTests
      runtest -c android.provider.SettingsBackupTest frameworks-core
      and manual

Change-Id: I6949cd517255670e2ce21ab2de24271082461b11