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Added the 'AllowOnlyPolicyNetworksToConnectIfAvailable' policy to ONC.
If a managed network is available in the lsit of visible networks, all
unmanaged networks are considered as prohibited. However, we don't
remove network configurations for unmanaged networks because we might
want to re-connect with them, once we lose availability of the managed
network.
If this policy is enabled, we are currently connected to an unmanaged
network and a managed network is available, we automatically connect
to the available managed network when the network scan finishes.

Bug: 848719
Change-Id: I6da37d1b9d7813ff7bdfd52ab0e28081f9e48631
Reviewed-on: https://chromium-review.googlesource.com/1122979
Commit-Queue: Alexander Hendrich <hendrich@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Cait Phillips <caitkp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579769}