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Propagates CrostiniAnsiblePlaybook policy value to CrostiniManager so
playbook applied to the default Crostini container during its
startup is the one specified by policy.

Test: unit_tests --gtest_filter="Crostini*"
Bug: 973793
Change-Id: I680faa6e3d570eab502d797633a39a12b8a3d6fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879298
Commit-Queue: Olya Kalitova <okalitova@chromium.org>
Reviewed-by: Nic Hollingum <hollingum@google.com>
Reviewed-by: Timothy Loh <timloh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709865}