Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - xci: Vagrantfile: Set $HOME/.local/bin to path

    It appears that pip install --user puts files in .local/bin
    which may not always be in $PATH.

    Change-Id: Ifa9fb3ee448471a00986e7f6f51544a3e436c9e1
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index 9c2b6ae..fd28594 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit 9c2b6ae1f9eccec52c1a6e576e281606ea4a4936
+Subproject commit fd28594a47af292d43352372f591174a6585eaad