Update git submodules

* Update docs/submodules/releng from branch 'master'
  to da2c360e74aa1be43f1d760f7f28f8ffdb571a16
  - Merge "Passing $WORKSPACE to build-image.sh"
  - Passing $WORKSPACE to build-image.sh

    build-image.sh has changed to take a new parameter: the cache directory
    that will be passed to disk-image-create. We are now passing $WORKSPACE
    as a parameter using the -w option.

    Signed-off-by: Luc Provoost <luc.provoost@intel.com>
    Change-Id: Ieaed8c87b07c0af022294f5e26af4aa64e1976b9

diff --git a/docs/submodules/releng b/docs/submodules/releng
index be4cbc6..da2c360 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit be4cbc60da26dc8ba5e1ae605fbe256f76a94996
+Subproject commit da2c360e74aa1be43f1d760f7f28f8ffdb571a16