Set release date for 2.8.0.

Signed-off-by: Ben Pfaff <blp@ovn.org>
Signed-off-by: Justin Pettit <jpettit@ovn.org>

NEWS

@@ -6,8 +6,7 @@ Post-v2.8.0
    - Linux kernel 4.13
      * Add support for compiling OVS with the latest Linux 4.13 kernel
 
-v2.8.0 - xx xxx xxxx
----------------------
+v2.8.0 - 31 Aug 2017
    - ovs-ofctl:
      * ovs-ofctl can now accept and display port names in place of numbers.  By
        default it always accepts names and in interactive use it displays them;

debian/changelog

@@ -10,9 +10,8 @@ openvswitch (2.8.0-1) unstable; urgency=medium
    * Use debhelper for DEB_VERSION_UPSTREAM.  Thanks to Clint Byrum
      <spamaps@debian.org> for this improvement.
    * New upstream version
-   - Nothing yet!  Try NEWS...
 
- -- Open vSwitch team <dev@openvswitch.org>  Fri, 04 Aug 2017 14:55:14 -0700
+ -- Open vSwitch team <dev@openvswitch.org>  Thu, 31 Aug 2017 09:32:16 -0700
 
 openvswitch (2.7.0-1) unstable; urgency=low
    [ Open vSwitch team ]