Check if old vagrant baseboxes are cleaned up in Jenkins

Originally created by @bertagaz on #14811 (Redmine)

Since we moved to basebox:clean_old in Jenkins, we need to see if basebox older than 4 monthes are cleaned up so that the /var/lib/jenkins partition does not get filled.

Related issues

Related to #12576 (closed)

Edited May 15, 2020 by bertagaz

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