Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Apex: fixes gspathname for euphrates

    Change-Id: Ia4523a185708a9d29243b522894b38fd1f047682
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 26a79bc..fd6b349 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 26a79bc759438bb3f25747776cced79957d8a8ff
+Subproject commit fd6b34948924fb3f8150823533a320c2b4a87f7b