MFC r249666, r249667, r249670, r249672, r249674, r249676, r249677, r249679,

MFC r249666, r249667, r249670, r249672, r249674, r249676, r249677, r249679,
    r249681, r249684, r249688, r249711, r249731, r250146

r249666, r249682:

Make libprocstat(3) extract procstat notes from a process core file.

PR:		kern/173723
Suggested by:	jhb
Glanced by:	kib

r249667:

Add procstat_getvmmap function to get VM layout of a process.

r249670:

Add procstat_getgroups function to retrieve process groups.

r249672:

Add procstat_getumask function to retrieve a process umask.

r249674:

Add procstat_getrlimit function to retrieve a process resource limits info.

r249676:

Add procstat_getpathname function to retrieve a process executable.

r249677:

Add procstat_getosrel function to retrieve a process osrel info.

r249679:

Extend libprocstat with functions to retrieve process command line
arguments and environment variables.

Suggested by:	stas
Reviewed by:	jhb and stas (initial version)

r249681:

Add procstat_getauxv function to retrieve a process auxiliary vector.

r249684:

Add procstat_getkstack function to dump kernel stacks of a process.

r249688:

Bump date.

r249711 (joel):

mdoc: end function context properly.

r249731:

Embed revision id in the library.

r250146:

KVM method support for procstat_getgroups, procstat_getumask,
procstat_getrlimit, and procstat_getosrel.

git-svn-id: svn://svn.freebsd.org/base/stable/9@250870 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f