Update git submodules

* Update docs/submodules/releng from branch 'master'
  - xci: Disable bifrost jobs until Intel slaves are back online

    Change-Id: I3a40077f14429de7a23ebf733dff5b13b8bc5d9e
    Signed-off-by: Fatih Degirmenci <fatih.degirmenci@ericsson.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index a9bac24..7810ab8 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit a9bac248658d45c2fc18c9ba44dac3adbd79b456
+Subproject commit 7810ab8107e39df76381f4daa6291d65cdeb5e6c