Update git submodules

* Update docs/submodules/releng from branch 'master'
  - xci: Ensure ansible is bootstrapped as last step

    Role requirements file is used during ansible bootstrap on opnfv
    host so we must ensure the right ansible role requirements is there
    in advance.

    Change-Id: I2c5a1edd82a51cbbe1469c31f37b5d638d32ec27
    Signed-off-by: Fatih Degirmenci <fatih.degirmenci@ericsson.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 43bcf54..bbb7f8e 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 43bcf54b87275d8639ab8e809759f82ad191a89b
+Subproject commit bbb7f8e0d7efcef60b9ecfa454fba0af57cc7707