MFC r315212, r315213, r315214, r315215:
mkimg(1): let calloc(3) do the multiplication.
nscd(8): let calloc(3) do the multiplying.
mpsutil(8): let calloc(3) do the multiplying.
ypbind(8): let calloc(3) do the multiplying.

MFC after: 1 week

MFC 290102

- Include usr.sbin/mpsutil for management of mps(4) and mpr(4) utilities.

- Thanks to scottl and bapt for making this happen.

Submitted by: bapt scottl
Reviewed by: kbowling
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D5529