1. Use install -d to create the entropy_dir if missing so that we can do it

   all in one command, with no permissions race.
2. Simplify the rotation logic by cd'ing into the directory, with a test
   to make sure that it succeeds.
3. Remove any files numbered higher than entropy_save_num. This helps when
   the user reduces the number, and may be useful for other purposes down
   the road.
4. Simplify the rotation logic by first testing the common case (it's a
   regular file) then testing if something else exists with the same name
   using elif. Also switch from using jot to simpler countdown format.
5. Fix logger lines and error messages to be more consistent, and wrap the
   code more consistently in the 80 column range. The "not a regular file"
   error message was mistakenly wrapped entirely in "quotes" which caused
   logger to include line-wrapping whitespace. Change that to wrap only
   the variables in quotes, which is both consistent and works better.
6. Update copyright to reflect the fact that changes were made this year.

Parts of 2-4 were taken from etc/periodic/daily/310.accounting

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