Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - xci: osa: Bump SHA to fix resolv.conf file creation and git-clone issues

    Container images have recently changed and this breaks lxc_hosts during
    cache preparation as shown below:

    May 04 07:59:47 fatal: [controller00]: FAILED! => {"ansible_job_id": "362521755821.32697",
    "attempts": 1, "changed": true, "cmd": "chroot /var/lib/machines/ubuntu-xenial-amd64 /usr/local/bin/cache-prep-commands.sh
    > /var/log/lxc-cache-prep-commands.log 2>&1", "delta": "0:00:00.018827", "end": "2018-05-04 07:59:45.614668",
    "finished": 1, "msg": "non-zero return code", "rc": 1, "start": "2018-05-04 07:59:45.595841",
    "stderr": "", "stderr_lines": [], "stdout": "", "stdout_lines": []}

    As such, we need to bump the SHA from the Queens branch to include the
    fix in XCI.

    We also need to bump SHA for repo_build role in order to bring
    in some upstream fixes when cloning git repositories.

    Change-Id: I9f04313f7eb1606e5e71ab8ecee7148d1c5b75ad
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index 88e917f..d736028 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit 88e917ff19049358218068c63bac7427a1faeb0b
+Subproject commit d736028bd362959f219265b220f773fd76e46315