Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "jjb: xci: Set XCI_PATH for bifrost jobs"
  - jjb: xci: Set XCI_PATH for bifrost jobs

    The bifrost jobs are using some scripts from the releng-xci repository
    so we need to set the XCI_PATH variable appropriately.

    Change-Id: Ibfd139d2401029b2ea577c4797b68f29362356ec
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index b73e1c1..fbdd451 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit b73e1c1f2058f6b80202d7d1a75b229c02ea858f
+Subproject commit fbdd4518f772e71316548ecd16b94a879873f650