Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "Install python-openstackclient by default"
  - Install python-openstackclient by default

    It is important to have the client installed for the ease of the
    users so they can use the client for trying out their new deployment.

    Change-Id: I091c1e23ff320cb9fcdb2743998483a6bc1fcdad
    Signed-off-by: Fatih Degirmenci <fatih.degirmenci@ericsson.com>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index 801ad93..93668a5 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit 801ad937b0e2a65f06765f9e279ce3a6f20452e0
+Subproject commit 93668a51c71b42aabe4aa95c46afe8beffc31c71