Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Remove functest alpine images from docker builds"
  - Remove functest alpine images from docker builds

    They are already built via Dockerhub automatically

    Change-Id: If0b336a0be741b17c2f7b80eaa51a0f235ad9ddf
    Signed-off-by: Jose Lausuch <jalausuch@suse.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 9334447..118a60f 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 93344479c4c05bccddeab1a88c224e2cad8a94e8
+Subproject commit 118a60fc4d82df4a3711c8b493fe4a37d6e045dc