combined NEWS of 2.6.0 and 2.7.0

1. fix the version mentioned in previous commit d9578c7d001e3a3a923f573c2aa8a017b2a237ac
   correct version in the commit is 2.7.0, such as:

   update NEWS for libva-utils 2.7.0

2. cherry pick ece1e5f100736afa640c2a507b45a6324df99fd9 from v2.6-branch
    it is NEWS update for v2.6.0

3. libva-utils 2.7.0 will be branch from this commit not previous one
    master version will be bumped to 2.8.0.pre1

Signed-off-by: Carl Zhang <carl.zhang@intel.com>
diff --git a/NEWS b/NEWS
index beeae5c..1ff1717 100644
--- a/NEWS
+++ b/NEWS
@@ -1,7 +1,7 @@
 libva-utils NEWS -- summary of changes.  2020-04-01
-Copyright (C) 2009-2019 Intel Corporation
+Copyright (C) 2009-2020 Intel Corporation
 
-Version 2.6.0 - 1.Apr.2020
+Version 2.7.0 - 1.Apr.2020
 * meson: add missing samples
 * sfcsample: drop unused Linux-only header
 * autotools: drop libdrm dependency (only libva-drm is used)
@@ -13,6 +13,11 @@
 * Align libva attribute check
 * Added displaying supported config attributes
 * add the VP samples README
+
+Version 2.6.0 - 10.Dec.2019
+* Align libva attribute check
+* Added displaying supported config attributes
+* add the VP samples README.
 * add VP sample for usrptr and 1:N output
 
 Version 2.5.0 - 8.Jul.2019