* src/chfn.c: Do not exit on pw_unlock failures.

	* src/chfn.c: Do not exit on pw_unlock failures.
	* src/grpconv.c, src/grpunconv.c, src/pwconv.c, src/pwunconv.c,
	src/vipw.c: Open syslog with the right identification name.
	* src/vipw.c: Log unlock errors to syslog.
	* src/vipw.c: Log edits to syslog.
	* src/chage.c, src/chfn.c, src/chsh.c, src/gpasswd.c,
	src/groupadd.c, src/groupdel.c, src/groupmod.c, src/grpconv.c,
	src/grpunconv.c, src/passwd.c, src/pwck.c, src/pwunconv.c,
	src/useradd.c, src/usermod.c: Harmonize the syslog levels. Failure
	to close or unlock are errors. Failure to open files are warnings.