Rename away htools/NEWS

Also add mention about it being obsolete.

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

htools/NEWS → htools/OLD-NEWS

@@ -2,6 +2,10 @@ Ganeti-htools release notes
 ===========================
 
 
+**Note**: After version 0.3.1, the htools sources have been integrated
+into the ganeti core repository, and released together with the ganeti
+releases. Thus this NEWS file is obsolete.
+
 Version 0.3.1 (Fri, 11 Mar 2011)
 --------------------------------