Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "prototypes: xci: Look for SSH keys in $HOME directory"
  - prototypes: xci: Look for SSH keys in $HOME directory

    We no longer run everything as root so we need to look for SSH keys
    in the appropriate home directory.

    Change-Id: Iae1f7eb80059e7d369c8e0c8b6c33c6a4f673f94
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 9620b46..ea72a90 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 9620b4676471e8cd21890776f8573112cdd16282
+Subproject commit ea72a904884b7fb933bebbaef78a5aa408b60acc