Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Fix docker run command for functest on fuel installer"
  - Fix docker run command for functest on fuel installer

    Fix docker error because of environment variable IMAGE_PROPERTIES
    for fuel installer in functest

    Change-Id: I916f965f8432216104b767e5aa62dc93a8f6ce72
    Signed-off-by: Delia Popescu <delia.popescu@enea.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index e5840dc..ab0a8c4 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit e5840dcb1af4f89450bfbb820cbfdb7520352485
+Subproject commit ab0a8c44bce2d28c3aee170a44064a40418dbd9e