Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Stop blacklisting tempest tests

    functest-virtual is fully verified by latest tempest_full.

    Change-Id: I212e3aa83c74d58945c9057a104db4a9fabd403b
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 2de8ea9..b22de24 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 2de8ea9fa5a9083133a6c4067391291732781989
+Subproject commit b22de24d6e5c8a37c0038d28f07fbd257d0f8563