add default vmemoryuse (unlimited), and samples

etc/login.conf

@@ -34,6 +34,7 @@ default:\
 	:openfiles=unlimited:\
 	:maxproc=unlimited:\
 	:sbsize=unlimited:\
+	:vmemoryuse=unlimited:\
 	:priority=0:\
 	:ignoretime@:\
 	:umask=022:
@@ -115,6 +116,7 @@ russian|Russian Users Accounts:\
 #	:nologin=/var/run/nologin:\
 #	:cputime=1h30m:\
 #	:datasize=8M:\
+#	:vmemoryuse=100M:\
 #	:stacksize=2M:\
 #	:memorylocked=4M:\
 #	:memoryuse=8M:\
@@ -137,6 +139,7 @@ russian|Russian Users Accounts:\
 #	:manpath=/usr/share/man /usr/X11R6/man /usr/local/man:\
 #	:cputime=4h:\
 #	:datasize=12M:\
+#	:vmemoryuse=infinity:\
 #	:stacksize=4M:\
 #	:filesize=8M:\
 #	:memoryuse=16M:\