Add variables referred by util-linux login, runuser and su, but not by
shadow.

Delete variables used by shadow implementation of login, su and runuser
that has no use in util-linux implementation.

Index: etc/login.defs
===================================================================
--- etc/login.defs.orig
+++ etc/login.defs
@@ -1,5 +1,7 @@
 #
 # /etc/login.defs - Configuration control definitions for the shadow package.
+# Some variables are used by login(1), su(1) and runuser(1) from util-linux
+# package as well pam pam_unix(8) from pam package.
 #
 #	$Id$
 #
@@ -17,9 +19,8 @@ FAIL_DELAY		3
 LOG_UNKFAIL_ENAB	no
 
 #
-# Enable logging of successful logins
+# Enable "syslog" logging of  newgrp(1) and sg(1) activity.
 #
-LOG_OK_LOGINS		no
 
 #
 # Limit the highest user ID number for which the lastlog entries should
@@ -31,10 +32,9 @@ LOG_OK_LOGINS		no
 #LASTLOG_UID_MAX
 
 #
-# Enable "syslog" logging of su(1) activity - in addition to sulog file logging.
-# SYSLOG_SG_ENAB does the same for newgrp(1) and sg(1).
+# Enable "syslog" logging of newgrp(1) and sg(1) activity - in addition
+# to sulog file logging.
 #
-SYSLOG_SU_ENAB		yes
 SYSLOG_SG_ENAB		yes
 
 #
@@ -58,6 +58,12 @@ MOTD_FILE	/etc/motd
 #MOTD_FILE	/etc/motd:/usr/lib/news/news-motd
 
 #
+# If set to "yes", login stops display content specified by MOTD_FILE after
+# the first accessible item in the list.
+#
+#MOTD_FIRSTONLY	no
+
+#
 # If defined, file which maps tty line to TERM environment parameter.
 # Each line of the file is in a format similar to "vt100  tty01".
 #
@@ -72,12 +78,33 @@ MOTD_FILE	/etc/motd
 HUSHLOGIN_FILE	.hushlogin
 #HUSHLOGIN_FILE	/etc/hushlogins
 
+# If this variable is set to "yes", hostname will be suppressed in the
+# login: prompt.
+#LOGIN_PLAIN_PROMPT	no
+
 #
 # *REQUIRED*  The default PATH settings, for superuser and normal users.
 #
 # (they are minimal, add the rest in the shell startup files)
-ENV_SUPATH	PATH=/sbin:/bin:/usr/sbin:/usr/bin
-ENV_PATH	PATH=/bin:/usr/bin
+#
+# ENV_PATH: The default PATH settings for non-root.
+#
+# ENV_ROOTPATH: The default PATH settings for root
+# (used by login, su and runuser).
+#
+# ENV_SUPATH is an ENV_ROOTPATH override for su and runuser
+# (and falback for login).
+#
+ENV_PATH	/bin:/usr/bin
+ENV_ROOTPATH	/sbin:/bin:/usr/sbin:/usr/bin
+#ENV_SUPATH	/sbin:/bin:/usr/sbin:/usr/bin
+
+# If this variable is set to "yes", su will always set path. every su
+# call will overwrite the PATH variable.
+#
+# Per default, only "su -" will set a new PATH.
+#
+ALWAYS_SET_PATH	no
 
 #
 # Terminal permissions
@@ -93,19 +120,6 @@ ENV_PATH	PATH=/bin:/usr/bin
 TTYGROUP	tty
 TTYPERM		0600
 
-#
-# Login configuration initializations:
-#
-#	ERASECHAR	Terminal ERASE character ('\010' = backspace).
-#	KILLCHAR	Terminal KILL character ('\025' = CTRL/U).
-#
-# The ERASECHAR and KILLCHAR are used only on System V machines.
-#
-# Prefix these values with "0" to get octal, "0x" to get hexadecimal.
-#
-ERASECHAR	0177
-KILLCHAR	025
-
 # Default initial "umask" value used by login(1) on non-PAM enabled systems.
 # Default "umask" value for pam_umask(8) on PAM enabled systems.
 # UMASK is also used by useradd(8) and newusers(8) to set the mode for new
@@ -163,6 +177,12 @@ SUB_GID_COUNT		    65536
 LOGIN_RETRIES		5
 
 #
+# Tell login to only re-prompt for the password if authentication
+# failed, but the username is valid. The default value is no.
+#
+LOGIN_KEEP_USERNAME	no
+
+#
 # Max time in seconds for login(1)
 #
 LOGIN_TIMEOUT		60
@@ -315,14 +335,6 @@ CHARACTER_CLASS         [ABCDEFGHIJKLMNO
 #GRANT_AUX_GROUP_SUBIDS yes
 
 #
-# Prevents an empty password field to be interpreted as "no authentication
-# required".
-# Set to "yes" to prevent for all accounts
-# Set to "superuser" to prevent for UID 0 / root (default)
-# Set to "no" to not prevent for any account (dangerous, historical default)
-PREVENT_NO_AUTH superuser
-
-#
 # Select the HMAC cryptography algorithm.
 # Used in pam_timestamp module to calculate the keyed-hash message
 # authentication code.