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Do not start a scan when the Default network changes unless both the Default network and the Tether network are disconnected.

This is done to prevent a scan from starting when Ethernet and Tether are both connected, and then Ethernet is disconnected (but Tether remains connected).

This CL also ensures a scan on login, regardless of whether or not the Default network is connected.

Bug: 672263, 738542
Change-Id: I062fdc3dc825df6a6e986db80964fa92732774f7
Reviewed-on: https://chromium-review.googlesource.com/598940
Commit-Queue: Leslie Watkins <lesliewatkins@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491834}