UBUNTU: Ubuntu-4.4.0-131.157

Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

debian.master/changelog

-linux (4.4.0-131.157) UNRELEASED; urgency=medium
+linux (4.4.0-131.157) xenial; urgency=medium
 
-  CHANGELOG: Do not edit directly. Autogenerated at release.
-  CHANGELOG: Use the printchanges target to see the curent changes.
-  CHANGELOG: Use the insertchanges target to create the final log.
+  * linux: 4.4.0-131.157 -proposed tracker (LP: #1779376)
+
+  * Cannot set MTU higher than 1500 in Xen instance (LP: #1781413)
+    - xen-netfront: Fix mismatched rtnl_unlock
+    - xen-netfront: Update features after registering netdev
 
  -- Stefan Bader <stefan.bader@canonical.com>  Mon, 18 Jun 2018 17:00:46 +0200