Run log-police.py for revprop changes too

[ryandesign (Ryan Carsten Schmidt)]

Via #15069 a pre-commit hook was installed which runs the ​log-police.py script to ensure that commit messages end with exactly one newline.

However log messages that get edited later aren't benefitting from the same standardization. See for example ​this message.

log-police.py should be run for revprop changes too, in the pre- or post-revprop-change hook (I'm not sure which is best). After that's in place, you should run log-police.py on all existing revisions to clean them up.

[wsiegrist@…]

Done.