Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "xci: Use distro specific ssh config while sshing to xci vms"
  - xci: Use distro specific ssh config while sshing to xci vms

    Change-Id: I5e8b738d4293040b2792a926cd13708180590bbb
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 40726f6..c12552a 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 40726f62ad2bf46cd1100438002dbb66bd7a2dcc
+Subproject commit c12552a6ce4ad4b5dd0e47f1c3b57bba49a8363b