Update git submodules

* Update docs/submodules/releng from branch 'master'
  - xci: Fix scenario determination for changes coming to releng-xci

    Earlier change took the possibility of dynamically determining the default
    scenario. This change puts part of it back which is based on the changed
    installer and/or other changed files.

    Change-Id: Ie6d9a9b0622ac4ae5ff0cf0e679fd26beed51747
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index cb80aad..c8599d6 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit cb80aad0eb95081e0c63c409c6b87d553d849576
+Subproject commit c8599d6aaad22383d71040120b0eef8a1df430f3