Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "prototypes: xci: xci-deploy: Do not use sudo when connecting to remote hosts"
  - prototypes: xci: xci-deploy: Do not use sudo when connecting to remote hosts

    In preparation for running xci-deploy as normal user, we do not need to
    gain elevated privileges in order to connect to remote hosts. SSH keys
    will be placed in user's ssh directory so we can ssh as normal user.

    Change-Id: Ieb705515ec191955a646839e8f195d089df184bd
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 42b51b5..d54e906 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 42b51b59fa7271731cc09995c1355db4e9ac426c
+Subproject commit d54e906bc7b46f051332153e8ec37e8c3f435548