MFC r244383:

MFC r244383:
- Set memorylocked limit to 64Kb for default login class.
  This prevents unprivileged users to lock too much memory.
- Set memorylocked limit to 64Mb for daemon login class.
  Some daemons such as amd(8) and watchdogd(8) calls mlockall(2) on
  startup, they are run from init(8) which uses daemon login class.
- Set memorylocked limit to unlimited for root login class.

Approved by:	kib (mentor)

git-svn-id: svn://svn.freebsd.org/base/stable/9@245415 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f