Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "prototypes: xci: xci-deploy.sh: Append trailing slash for rsync vars"
  - prototypes: xci: xci-deploy.sh: Append trailing slash for rsync vars

    The 'synchronize' Ansible module uses rsync and for that we need
    to indicate that we want to copy the contents of the development path
    and not the development path itself. As such we need to ensure that a
    trailing slash is always appended to the user variables but we need to
    also ensure that we will not end up with double slashes.

    Change-Id: I0103b754585931fa1dcd3966c52d7e4a8f2f63f6
    Signed-off-by: Markos Chandras <mchandras@suse.de>