Update git submodules

* Update docs/submodules/releng from branch 'master'
  to cb0a1ee952bdff30571468f6574059466391e92b
  - Remove former vswitchperf jobs

    They should have been removed when vineperf ones were
    copied from them.

    Change-Id: I6c1bdcad5b43ed5260d640527b3aa63e1f0a669f
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 81f941f..cb0a1ee 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 81f941ffe09697d05e904e5f13f45e8cceb89057
+Subproject commit cb0a1ee952bdff30571468f6574059466391e92b