Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Remove opnfv vm from known_hosts

    Change-Id: If53b51fc26d642afa39c5e618afcd23fab395acc
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index d88ee53..c5d8334 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit d88ee53b7eceeee2e59ba3bc2a862722185c0e87
+Subproject commit c5d83347c1550efe2e7eb4e114ac2fc0a18f6e6a