Update git submodules

* Update docs/submodules/releng from branch 'master'
  - xci: SHA bump as of April 4

    The bifrost, osa, and ansible role requirements sha1s are bumped
    based on the HEAD of the master of the projects on April 4.

    designate is also disabled based on the comment the osa commit
    mentions.

    https://review.openstack.org/gitweb?p=openstack/openstack-ansible.git;a=commit;h=d9e1330c7ff9d72a604b6b4f3af765f66a01b30e

    Change-Id: Ib47515490c799d3b1d2b4b319277c8900cd37328
    Signed-off-by: Fatih Degirmenci <fatih.degirmenci@ericsson.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 5412a1b..88395f5 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 5412a1b30129d25b6f7f7de6c5262e2e3edc699b
+Subproject commit 88395f5f3a5b4c5b41451fbff6a69ecba05a5e20