Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "xci: Add/update variables to tool, user, and flavors"
  - xci: Add/update variables to tool, user, and flavors

    Updates
    - RAM allocations for the flavors mini and noha increased to 12GB.
    - Distro variables introduced to tool as it will be used by the CI and
    the developers.
    - LOG_PATH and RUN_TEMPEST are now available in user variables.

    Change-Id: I4a73d7b79761d81f605cdb3fa9771ca40e9f9f02
    Signed-off-by: Fatih Degirmenci <fatih.degirmenci@ericsson.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 8df5b94..848d10e 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 8df5b9486ad80efae75dcf719acb705f9c3807b9
+Subproject commit 848d10e2255497239fa6b0e3d4e9e0701e3b5f54