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CL:857742 and CL:857743 added the support for APN authentication method
specified in the mobile operator database in shill. CL:1081764 updated shill to
respect the authentication method in the user-specified APN property. This CL
adds the ONC translation of the APN authentication property, so that a
follow-up CL can update the settings UI to allow specifying the APN
authentication for the user-specified APN.

BUG=b:68680371

Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I7e110a3a4841f8ec2ee725cdc799999b51a45746
Reviewed-on: https://chromium-review.googlesource.com/1096430
Commit-Queue: Ben Chan <benchan@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566721}