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

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

Mark the structure fields as const.

This allows us to simply place these strings as constants in the table
itself, letting the compiler decide to simply merge duplicate strings.

Remove unused includes. Make it WARNS=6 friendly. Concerning bin/2442, make
a new function dup_shell() to replace ok_shell() and make it unconditionnally
strdup() its result to make the caller's code simplier. Change ok_shell() to
just return an integer value suitable for tests (it was used mainly for that
purpose). Do not use strdup() in the caller's code but rely on dup_shell()
that will do the job for us.

PR: bin/2442

Use libutil and libypclnt for all passwd manipulation and NIS needs.

Sponsored by: DARPA, NAI Labs

Fix warns, ANSIfy, use __FBSDID(), sort headers.

remove __P

Bump up the E_SHELL constant after an extra field was added, thus making
this refer to the wrong data.
Submitted by: axl@iafrica.com (Sheldon Hearn)

Submitted by: Peter Hawkins <thepish@FreeBSD.org>
Add functionality for support for more than 4 subfields within gcos. chsh,
chpass etc did not parse beyond the 4th field previously and so truncated
gcos on updating the database.

This commit was generated by cvs2svn to compensate for changes in r1590,
which included commits to RCS files with non-trunk default branches.

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