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This change updates the SmbService setup flow so that setup is not run
when SmbService is created on the LockScreen and adds a call to
SetupKerberos for ChromAD users.

Bug: chromium:757625
Test: verified on local ActivceDirectory test network
Change-Id: I36ca8f48368be33e740ee1128e8cc5cc23ca8e5d
Reviewed-on: https://chromium-review.googlesource.com/1045130Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557193}