Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Pass int arguments to auditon(2)'s A_GETCOND API rather than long
arguments. This change should be MFC'd with OpenBSM 1.1 since they
are interdependent.

MFC after: 2 weeks
Obtained from: TrustedBSD Project
Sponsored by: Apple, Inc.

Fix some warnings by making things const, adding missing headers,
removing some unused variables and making a variable unsigned.

MFC after: 3 weeks

Make login audit-enabled, submitting audit records for the login and logout
events. The specifics of submitting the records is contained within
login_audit.c.
Document the auditing behavior in the man page.

Obtained from: TrustedBSD Project, Apple Computer, Inc.
Approved by: rwatson (mentor)