Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "jjb: xci: Only set default scenario if no scenario is set"
  - jjb: xci: Only set default scenario if no scenario is set

    Previously, the code was already setting the default scenario if we had
    changes outside the xci/scenario directory. However, this is somewhat
    problematic since scenarios may touch other files which do not necessary
    affect other scenarios such as anything in xci/playbooks etc. As such,
    lets only set a default scenario if no scenario was set up to that
    point. However, since installers and scenarios need to match, we also
    need to consider installer changes because we fallback to the default
    scenario. Finally, since we are filtering results with 'uniq' we can
    simply drop the bash regexps prior to adding the scenario to the array.

    Change-Id: Ie961071b3e93d04a860bb6655513654208b1a9d4
    Signed-off-by: Markos Chandras <mchandras@suse.de>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 97733bc..b73e1c1 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 97733bc25ce3f415dd05bce4aa9f2cee8f2a11e7
+Subproject commit b73e1c1f2058f6b80202d7d1a75b229c02ea858f