Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Ensure the ssh config files are created per distro

    If 2 jobs for different distros start on the same host, the
    generated xci-vm-config files might be rewritten by both jobs
    causing trouble for the other. This change creates ssh config
    per distro to prevent potential issues.

    Change-Id: If6c0a86fd51bf3ba920e9206849ed1537894c7e1
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index c8dfb6d..faf5144 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit c8dfb6d4964499bd5289215dcdf11d0a7699b405
+Subproject commit faf5144aa6c87642d627b63a8464a8e96949e9fe