MFC r227482:

MFC r227482:

The default setting, daily_accounting_compress="NO", was causing
only 1 old file to be saved, so fix this.

While I'm here, fix a very old off-by-one error causing 1 more
file than specified in daily_accounting_save to be saved because
acct.0 was not taken into account (pun intended). Change that, and
use a more thorough method of finding old files to delete. Partly
just because this is the right thing to do, but also to silently
fix the extra log that would have been left behind forever with the
previous method.

Approved by:	re (kensmith)

git-svn-id: svn://svn.freebsd.org/base/releng/9.0@228166 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f