Disable long option abbreviation (--destructive vs --destructive-mode)

[mattculler]

What needs to get done

By default, argparse allows abbreviated commands, such as --destructive-mode being specified as --destructive.

Since Python 3.5, this default behavior can be disabled by setting allow_abbrev=False when instantiating argparse.ArgumentParser:

https://docs.python.org/3/library/argparse.html#allow-abbrev

Found by @thp-canonical and @Ardelean-Calin

Why it needs to get done

This avoids wrongly learning command-line arguments that might at some point not be unique anymore.

[syncronize-issues-to-jira]

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The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3114.

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