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Adds Ansible playbook application step to default Crostini container
startup if Ansible is successfully installed to default Crostini container.

Test: unit_tests --gtest_filter="Crostini*"
Bug: 998124
Change-Id: Id892b5316e2971e4a81ab6d155654c30202d4a6f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1847343Reviewed-by: Nic Hollingum <hollingum@google.com>
Reviewed-by: Timothy Loh <timloh@chromium.org>
Commit-Queue: Olya Kalitova <okalitova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704621}