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This adds a parameter to ConnectToNetwork 'succeed_on_send_connect'.
If set, ConnectToNetwork will call the 'success' callback as soon as
a connect request is sent to Shill (if there were no configuration
errors) instead of after the connect succeeds.

This is used by the networkingPrivate implementation to more correctly
implement the API.

This CL causes the Settings based network config UI to close its dialog
when the connection starts.

Bug: 795715
For minor changes to comonents/arc/net:
TBR=hidehiko@chromium.org

Change-Id: I5de65a32a46d57dc628c65542a275505d4d7c944
Reviewed-on: https://chromium-review.googlesource.com/875002Reviewed-by: Toni Barzic <tbarzic@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#530661}