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Add new HTML/JS files for the new Kerberos OS settings sections. Also,
update BUILD files to include the new section. This new section is still
behind the KerberosSettingsSection flag. The actual content for this
section will be added in the future, reusing code from the OS people
section.

Bug: 983041
Change-Id: I21d1a2ad7be93c284d017492ee487d9c574f9fad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2558400Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Felipe Andrade <fsandrade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834429}