Recommended update for python-argparse-manpage

This update for python-argparse-manpage fixes the following issues:

- Consolidate the versions of python-argparse-manpage for SLE. (jsc#SLE-12826)
- Don't use %python3_only command, but properly use alternatives.
- Drop additional .br tag from paragraphs so the multiline text is nicer
- Provide argparse-manpage via entry_point

This update was imported from the SUSE:SLE-15:Update update project.

Fixed bugs
Selected Binaries
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