Update git submodules

* Update docs/submodules/releng from branch 'master'
  - [Functest] Add TESTCASE_OPTIONS env variable to the Alpine containers

    This patch also removes the --report flag when running a single
    test case (functest-suite type of jobs)

    Change-Id: Ic94fba53ced7c6f908905c02577e1b104f15afb7
    Signed-off-by: Jose Lausuch <jalausuch@suse.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index b040e3b..f612c09 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit b040e3b644262b544d24a74f5787f6cb4e0476c8
+Subproject commit f612c09e6fe092dc5a3d89f1ca83e7eb389cbc2d