Added Linux-PAM and updated description.

Signed-off-by: Nikos Mavrogiannopoulos <nmav@gnutls.org>

libs/libpam/files/pam.d/other

@@ -0,0 +1,16 @@
+#
+# /etc/pam.d/other - specify the PAM fallback behaviour
+#
+# Note that this file is used for any unspecified service; for example
+#if /etc/pam.d/cron  specifies no session modules but cron calls
+#pam_open_session, the session module out of /etc/pam.d/other is
+#used.  If you really want nothing to happen then use pam_permit.so or
+#pam_deny.so as appropriate.
+
+# We fall back to the system default in /etc/pam.d/common-*
+# 
+
+auth       include      common-auth
+account    include      common-account
+password   include      common-password
+session    include      common-session