Get NEWS sections in consistent order

For all releases, the section on incompatible changes comes first,
as these changes are the ones to take most care of. New features
are not as important, as they can safely be ignored if you have no
use for them. Get the section on version 2.10.0 into that order, too.
Signed-off-by: Klaus Aehlig <aehlig@google.com>
Reviewed-by: Michele Tartara <mtartara@google.com>

NEWS

@@ -7,17 +7,17 @@ Version 2.10.0 alpha1
 
 *(unreleased)*
 
-New features
-~~~~~~~~~~~~
-- KVM hypervisors can now access RBD storage directly without having to
-  go through a block device.
-
 Incompatible/important changes
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 - Adding disks with 'gnt-instance modify' now waits for the disks to sync per
   default. Specify --no-wait-for-sync to override this behavior.
 
+New features
+~~~~~~~~~~~~
+- KVM hypervisors can now access RBD storage directly without having to
+  go through a block device.
+
 
 Version 2.9.0 rc1
 -----------------