Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Resize OPNFV VM Disk

    OPNFV VM creation is separated from the rest of the nodes, resulting
    in its disk being left without resizing. It is important to resize
    its disk to the value defined in its PDF opnfv_vm.yml so the installation
    of the other tools does not fail due to lack of space.

    Change-Id: I8300e6e355d11788cc983fcebca56076e89918e1
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index 633523b..d8035cd 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit 633523bdadee2617573cdbafa7d24269da738db8
+Subproject commit d8035cd012c941c615862e75ed54ad5fc3620846