Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Move DEPLOY_SCENARIO out of testapi-parameters"
  - Move DEPLOY_SCENARIO out of testapi-parameters

    These have been moved back into installer-params.yml and added to the
    daisy jobs where 'testapi-parameters' is being used.

    Including this in the list of parameters would cause duplication as most
    installers already include 'DEPLOY_SCENARIO' as a parameter. The
    'DEPLOY_SCENARIO' parameter is also sometimes defined through a macro,
    which could cause second declaration of DEPLOY_SCENARIO (defaulting to
    'os-nosdn-nofeature-ha') to always be used.

    Documentation has been added to the parameter to explain the related
    macros and how they should be used.

    Change-Id: I9aef031dbcf523ae2db15695ce294bd85025530d
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index e99861f..a753058 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit e99861f4bf3ddb3c5bf4edd4458ef0a690345f3f
+Subproject commit a7530584a166fc1b2129a88d3ab52710f6945c63