openvswitch: update to version 2.11.6 (security fix)

Fixes CVEs:
- CVE-2020-35498
- In DPDK: CVE-2015-8011 and CVE-2020-27827
- In LLDP: CVE-2019-14818, CVE-2020-10722, CVE-2020-10723 and CVE-2020-10724

Removed patches:
- 0001-compat-Include-confirm_neigh-parameter-if-needed.patch because they
are included in this release as it was backported
- 0010-acinclude-Fix-build-with-kernels-with-prandom-moved-.patch
included in this release as it was backported

Other patches were refreshed.

Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>

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

@@ -8,8 +8,6 @@ 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