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Wire up dialog to Ansible management service. States are added to modify
strings and buttons based on events that happened.

Tests for successful and unsuccessful dialog flow.

TEST: browser_tests --gtest_filter="*CrostiniAnsibleSoftware*"
BUG: 998097
Change-Id: I19d0693a068efeb5b9b6af7a0b04c4ee0ad38ec4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1789229
Commit-Queue: Christopher Gunadi <chrisgunadi@google.com>
Reviewed-by: Olya Kalitova <okalitova@chromium.org>
Reviewed-by: Alex Oldemeier <aoldemeier@chromium.org>
Reviewed-by: Nic Hollingum <hollingum@google.com>
Reviewed-by: Timothy Loh <timloh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698444}