Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Fix the figure size in user guide

    Change-Id: I550860f574765a3035e9025e254f6d7ba110e0e4
    Signed-off-by: Fatih Degirmenci <fatih.degirmenci@ericsson.com>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index f1be446..21a82ce 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit f1be44648ccb6ff9a73c953fa7838d0a177b8d93
+Subproject commit 21a82ce0689793f85777ea1be65c8c068f0dabd4