Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 0f678c93ae5f1de51cebb004061244e9508ee49f
  - Stop overriding default Rally blacklists

    The default Rally blacklist has been used asis for a while.

    Change-Id: Idc84935ec2bbc31a841764499c29c5cb1923b3c5
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 70a61da..0f678c9 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 70a61daa082a249542cceaf33b796954625118a1
+Subproject commit 0f678c93ae5f1de51cebb004061244e9508ee49f