Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Fix the proxy command and hostname for opnfv vm in ssh config

    Change-Id: Ic036a4f5ef8b24b88154f9314957339d3954839a
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index 4307ead..c8dfb6d 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit 4307ead229533fc0dd9f076dcdd5e5fa299313b0
+Subproject commit c8dfb6d4964499bd5289215dcdf11d0a7699b405