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Adds a UpgradeRemoveUnusedPackages param to use
in the ansible when conditional for the removal
Adds package removal to step2 right after a service
is stopped and disabled on step2. Package updates
happen in step3 so ideally remove before that.
The package removal task has ignore_errors true
so dependencies or other issue removing packages will
not fail the upgrade workflow.
Also adds this to the upgrade environment files
for visibility and defaulting false
Change-Id: Ie4e4a2d41f7752c5a13507a7c15c6f68e203cfca
Related-Bug: 1701501
(cherry picked from commit ce0ef2fa207698c1ae61c1620fe3c5e8d1c7bfca)
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marios