openvswitch: bump to version 2.11.3

Two patches were backported to fix issue openwrt/packages#12737

  0002-compat-Fix-ipv6_dst_lookup-build-error.patch
  0003-compat-Backport-ipv6_stub-change.patch

One was deleted as it is now part of 2.11.3

  0005-datapath-conntrack-fix-include-for-IP6_DEFRAG_CONNTR.patch

Other patches refreshed

Reported-by: Josef Schlehofer <pepe.schlehofer@gmail.com>
Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

net/openvswitch/patches/0008-build-disable-building-tests.patch

@@ -0,0 +1,22 @@
+From 613f2bd84623d4f9094697357a7b6bda4611ce30 Mon Sep 17 00:00:00 2001
+From: Yousong Zhou <zhouyousong@yunionyun.com>
+Date: Tue, 21 Aug 2018 13:02:21 +0000
+Subject: [PATCH] build: disable building tests
+
+Signed-off-by: Yousong Zhou <zhouyousong@yunionyun.com>
+---
+ Makefile.am | 1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/Makefile.am b/Makefile.am
+index 417f53230..3fc630f33 100644
+--- a/Makefile.am
++++ b/Makefile.am
+@@ -480,7 +480,6 @@ include m4/automake.mk
+ include lib/automake.mk
+ include ofproto/automake.mk
+ include utilities/automake.mk
+-include tests/automake.mk
+ include include/automake.mk
+ include third-party/automake.mk
+ include debian/automake.mk