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As we try to add new e2e tethering tests, we need a way to make the
host scan occur normally even when there is an ethernet connection
because there's always an ethernet connection to deploy the test.

This CL creates the infrastructure necessary to create a flag to
override the prohibition against searching for a tethering host with an
ethernet connection by gating it on booleans called
ignore_wired_networks_

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Testing:

I manually tested that this change causes the tethering notification to
appear when the user logs in with an ethernet connection but no wifi
connection. For comparison, I also tested that logging in with a wifi
network does not cause the notification to appear.

Bug: 904609
Change-Id: I7406274cd159ae2b18ad6a22ca90cba76b98dbad
Reviewed-on: https://chromium-review.googlesource.com/c/1332693
Commit-Queue: Jordy Greenblatt <jordynass@chromium.org>
Reviewed-by: Jeremy Klein <jlklein@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607461}