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Adds check whether Crostini container is already configured, so that
default Crostini container configuration is triggered only when default
Crostini container is not yet successfully configured using currently
set CrostiniAnsiblePlaybook policy.

Before this CL: container is reconfigured each time container is started
if policy is specified & feature flag is set.

TEST: unit_tests --gtest_filter="*Ansible*"
Bug: 1024859
Change-Id: If1dc83a8130d35a9aa4eba5c8f5e8b39ea1e0dbf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2000701
Commit-Queue: Olya Kalitova <okalitova@chromium.org>
Reviewed-by: Nic Hollingum <hollingum@google.com>
Reviewed-by: Nikita Podguzov <nikitapodguzov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732810}