Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Compass: add cacert file to enable SSL verification"
  - Compass: add cacert file to enable SSL verification

    Now only Openstack https is supported by OSA repo LXC in compass
    deployment, so certification file is required to enable SSL
    verification.
    After [1] is merged, the cacert file os_cacert will be provided
    in the container compass-tasks.

    [1]: https://gerrit.opnfv.org/gerrit/#/c/37451/

    Change-Id: Id747cef1955733a1c93feb20a26d503a5de1fb93
    Signed-off-by: Linda Wang <wangwulin@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 70b7e9c..57acae9 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 70b7e9c3c80f50bfdc943b44cd2539c0e225db27
+Subproject commit 57acae96d4f574d3ba4a3f2d49faa972d13666d2