MFC 280721:

MFC 280721:
Allow additional flags to be passed to netstat -i in the daily status check.
In particular, this allows an administrator to specify "-h" for human
readable output if that is preferred.

The default setting passes "-d", so that can be excluded by using a custom
setting.

git-svn-id: svn://svn.freebsd.org/base/stable/10@282243 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f