Run the doctests of our Python scripts
Originally created by @segfault on #15330 (Redmine)
Some of our Python scripts, e.g. those that were ported from bash as part of #11198, have doctests. We should run them on our CI.
Note that some of our doctests require Python 3.6 or newer: see 266aa246 ⇒ blocked by sysadmin#17731.
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