Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "xci: provision-vm-nodes: Use sudo to remove the XCI directory"
  - xci: provision-vm-nodes: Use sudo to remove the XCI directory

    Since I00d77e1fc62cccda7920af3469af9d44247780f4 the entire XCI_DEVEL_ROOT
    is being removed. However, some of the files are owned by root so we
    need elevated privileges to remove these files and directories

    Change-Id: Ie10018ded198b922077e38fa5776fca098418192
    Signed-off-by: Markos Chandras <mchandras@suse.de>